diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..66d25e7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,21 @@
+#Gradle
+.gradle/
+build/
+out/
+classes/
+
+#IDEA
+.idea/
+*.iml
+*.ipr
+*.iws
+
+#vscode
+.settings/
+.vscode/
+bin/
+.classpath
+.project
+
+#fabric
+run/
\ No newline at end of file
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..d8fa74a
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2020 Linguardium
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..37b0988
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,82 @@
+plugins {
+	id 'fabric-loom' version '0.4-SNAPSHOT'
+	id 'maven-publish'
+}
+
+sourceCompatibility = JavaVersion.VERSION_1_8
+targetCompatibility = JavaVersion.VERSION_1_8
+
+archivesBaseName = project.archives_base_name
+version = project.mod_version
+group = project.maven_group
+
+minecraft {
+}
+repositories {
+	//maven { url "https://jitpack.io"}
+}
+dependencies {
+	//to change the versions see the gradle.properties file
+	minecraft "com.mojang:minecraft:${project.minecraft_version}"
+	mappings "net.fabricmc:yarn:${project.yarn_mappings}:v2"
+	modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
+
+	modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_api_version}"
+	//modRuntime "com.github.Linguardium:open2lan:+"
+}
+
+processResources {
+	inputs.property "version", project.version
+
+	from(sourceSets.main.resources.srcDirs) {
+		include "fabric.mod.json"
+		expand "version": project.version
+	}
+
+	from(sourceSets.main.resources.srcDirs) {
+		exclude "fabric.mod.json"
+	}
+}
+
+// ensure that the encoding is set to UTF-8, no matter what the system default is
+// this fixes some edge cases with special characters not displaying correctly
+// see http://yodaconditions.net/blog/fix-for-java-file-encoding-problems-with-gradle.html
+tasks.withType(JavaCompile) {
+	options.encoding = "UTF-8"
+}
+
+// Loom will automatically attach sourcesJar to a RemapSourcesJar task and to the "build" task
+// if it is present.
+// If you remove this task, sources will not be generated.
+task sourcesJar(type: Jar, dependsOn: classes) {
+	classifier = "sources"
+	from sourceSets.main.allSource
+}
+
+jar {
+	from "LICENSE"
+}
+
+// configure the maven publication
+publishing {
+	publications {
+		mavenJava(MavenPublication) {
+			// add all the jars that should be included when publishing to maven
+			artifact(jar) {
+				builtBy remapJar
+			}
+			artifact("${project.buildDir.absolutePath}/libs/${archivesBaseName}-${project.version}.jar"){
+				builtBy remapJar
+			}
+			artifact(sourcesJar) {
+				builtBy remapSourcesJar
+			}
+		}
+	}
+
+	// select the repositories you want to publish to
+	repositories {
+		// uncomment to publish to the local maven
+		// mavenLocal()
+	}
+}
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..f0deee9
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,14 @@
+org.gradle.jvmargs  = -Xmx1G
+
+#Fabric properties
+minecraft_version   = 1.16.1
+yarn_mappings       = 1.16.1+build.21
+loader_version      = 0.9.0+build.204
+
+#Mod properties
+mod_version         = 0.0.1
+maven_group         = mod.linguardium.mobcapped
+archives_base_name  = mobcapped
+
+#Dependencies
+fabric_api_version  = 0.15.1+build.380-1.16.1
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..5c2d1cf
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..d95da9b
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Fri Jul 24 00:22:36 PDT 2020
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.5.1-all.zip
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..8e25e6c
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,188 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin, switch paths to Windows format before running java
+if $cygwin ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=$((i+1))
+    done
+    case $i in
+        (0) set -- ;;
+        (1) set -- "$args0" ;;
+        (2) set -- "$args0" "$args1" ;;
+        (3) set -- "$args0" "$args1" "$args2" ;;
+        (4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=$(save "$@")
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
+  cd "$(dirname "$0")"
+fi
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..9618d8d
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,100 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..89fa615
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,10 @@
+pluginManagement {
+    repositories {
+        jcenter()
+        maven {
+            name = 'Fabric'
+            url = 'https://maven.fabricmc.net/'
+        }
+        gradlePluginPortal()
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/mod/linguardium/mobcapped/Main.java b/src/main/java/mod/linguardium/mobcapped/Main.java
new file mode 100644
index 0000000..cbf60e0
--- /dev/null
+++ b/src/main/java/mod/linguardium/mobcapped/Main.java
@@ -0,0 +1,27 @@
+package mod.linguardium.mobcapped;
+
+import net.fabricmc.api.ModInitializer;
+
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+public class Main implements ModInitializer {
+
+    public static Logger LOGGER = LogManager.getLogger();
+
+    public static final String MOD_ID = "mobcapped";
+    public static final String MOD_NAME = "MobCapped";
+
+    @Override
+    public void onInitialize() {
+        NewGameRules.init();
+        log(Level.INFO, "Initializing");
+        //TODO: Initializer
+    }
+
+    public static void log(Level level, String message){
+        LOGGER.log(level, "["+MOD_NAME+"] " + message);
+    }
+
+}
\ No newline at end of file
diff --git a/src/main/java/mod/linguardium/mobcapped/NewGameRules.java b/src/main/java/mod/linguardium/mobcapped/NewGameRules.java
new file mode 100644
index 0000000..91377bd
--- /dev/null
+++ b/src/main/java/mod/linguardium/mobcapped/NewGameRules.java
@@ -0,0 +1,28 @@
+package mod.linguardium.mobcapped;
+
+
+import net.minecraft.world.GameRules;
+
+public class NewGameRules {
+    public static String MOBCAP_MONSTERS = "mobCapMonsters";
+    public static String MOBCAP_CREATURES = "mobCapCreatures";
+    public static String MOBCAP_AMBIENT = "mobCapAmbient";
+    public static String MOBCAP_MISC = "mobCapMisc";
+    public static String MOBCAP_AQUATIC_CREATURE = "mobCapAquaticCreature";
+    public static String MOBCAP_AQUATIC_AMBIENT = "mobCapAquaticAmbient";
+    public static String PER_PLAYER_MOBCAP = "mobCapPerPlayer";
+
+    public static GameRules.Key<GameRules.IntRule> MOBCAP_MONSTERS_KEY = new GameRules.Key<GameRules.IntRule>(MOBCAP_MONSTERS, GameRules.Category.MOBS);
+    public static GameRules.Key<GameRules.IntRule> MOBCAP_CREATURES_KEY = new GameRules.Key<>(MOBCAP_CREATURES, GameRules.Category.MOBS);
+    public static GameRules.Key<GameRules.IntRule> MOBCAP_AMBIENT_KEY = new GameRules.Key<GameRules.IntRule>(MOBCAP_AMBIENT, GameRules.Category.MOBS);
+    //public static GameRules.Key<GameRules.IntRule> MOBCAP_MISC_KEY = new GameRules.Key<GameRules.IntRule>(MOBCAP_MISC, GameRules.Category.MOBS);
+    public static GameRules.Key<GameRules.IntRule> MOBCAP_AQUATIC_CREATURE_KEY = new GameRules.Key<GameRules.IntRule>(MOBCAP_AQUATIC_CREATURE, GameRules.Category.MOBS);
+    public static GameRules.Key<GameRules.IntRule> MOBCAP_AQUATIC_AMBIENT_KEY = new GameRules.Key<GameRules.IntRule>(MOBCAP_AQUATIC_AMBIENT, GameRules.Category.MOBS);
+    public static GameRules.Key<GameRules.BooleanRule> PER_PLAYER_MOBCAP_KEY = new GameRules.Key<GameRules.BooleanRule>(PER_PLAYER_MOBCAP, GameRules.Category.MOBS);
+
+
+    public static void init() {
+
+    }
+
+}
diff --git a/src/main/java/mod/linguardium/mobcapped/helpers/SpawnHelperInfoInterface.java b/src/main/java/mod/linguardium/mobcapped/helpers/SpawnHelperInfoInterface.java
new file mode 100644
index 0000000..09321d5
--- /dev/null
+++ b/src/main/java/mod/linguardium/mobcapped/helpers/SpawnHelperInfoInterface.java
@@ -0,0 +1,14 @@
+package mod.linguardium.mobcapped.helpers;
+
+import net.minecraft.entity.EntityType;
+import net.minecraft.entity.SpawnGroup;
+import net.minecraft.entity.mob.MobEntity;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.chunk.Chunk;
+
+public interface SpawnHelperInfoInterface {
+    public boolean MobCapped$checkBelowMobCap(SpawnGroup spawnGroup);
+    public boolean MobCapped$isBelowCap$CustomCapacity(SpawnGroup group, int capacity, int chunkArea);
+    public boolean PublicTest(EntityType<?> type, BlockPos pos, Chunk chunk);
+    public void PublicRun(MobEntity entity, Chunk chunk);
+}
diff --git a/src/main/java/mod/linguardium/mobcapped/mixin/BooleanGameRuleAccessor.java b/src/main/java/mod/linguardium/mobcapped/mixin/BooleanGameRuleAccessor.java
new file mode 100644
index 0000000..673ee1b
--- /dev/null
+++ b/src/main/java/mod/linguardium/mobcapped/mixin/BooleanGameRuleAccessor.java
@@ -0,0 +1,17 @@
+package mod.linguardium.mobcapped.mixin;
+
+import net.minecraft.world.GameRules;
+import org.apache.commons.lang3.NotImplementedException;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.gen.Invoker;
+
+@Mixin(GameRules.BooleanRule.class)
+public interface BooleanGameRuleAccessor {
+
+    @Invoker("create")
+    public static GameRules.Type<GameRules.BooleanRule> MobCapped$create(boolean defaultValue) {
+        throw new NotImplementedException("Mixin failed");
+     }
+
+}
\ No newline at end of file
diff --git a/src/main/java/mod/linguardium/mobcapped/mixin/IntegerGameRuleAccessor.java b/src/main/java/mod/linguardium/mobcapped/mixin/IntegerGameRuleAccessor.java
new file mode 100644
index 0000000..42f228d
--- /dev/null
+++ b/src/main/java/mod/linguardium/mobcapped/mixin/IntegerGameRuleAccessor.java
@@ -0,0 +1,18 @@
+package mod.linguardium.mobcapped.mixin;
+
+import org.apache.commons.lang3.NotImplementedException;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.gen.Invoker;
+
+import net.minecraft.world.GameRules;
+
+@Mixin(GameRules.IntRule.class)
+public interface IntegerGameRuleAccessor {
+
+    @Invoker("create")
+    public static GameRules.Type<GameRules.IntRule> MobCapped$create(int defaultValue) {
+        throw new NotImplementedException("Mixin failed");
+     }
+
+}
\ No newline at end of file
diff --git a/src/main/java/mod/linguardium/mobcapped/mixin/RegisterGameRule.java b/src/main/java/mod/linguardium/mobcapped/mixin/RegisterGameRule.java
new file mode 100644
index 0000000..64a1ecf
--- /dev/null
+++ b/src/main/java/mod/linguardium/mobcapped/mixin/RegisterGameRule.java
@@ -0,0 +1,29 @@
+package mod.linguardium.mobcapped.mixin;
+
+import net.minecraft.world.GameRules;
+import org.apache.commons.lang3.NotImplementedException;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Unique;
+import org.spongepowered.asm.mixin.gen.Invoker;
+
+import static mod.linguardium.mobcapped.NewGameRules.*;
+
+
+@Mixin(GameRules.class)
+public class RegisterGameRule{
+
+    @Invoker("register")
+    public static <T extends GameRules.Rule<T>> GameRules.Key<T> MobCapped$create(String key, GameRules.Category category, GameRules.Type<T> type) {
+        throw new NotImplementedException("GameRules mixin failed");
+    }
+    static {
+        MobCapped$create(MOBCAP_MONSTERS, GameRules.Category.MOBS, IntegerGameRuleAccessor.MobCapped$create(70));
+        MobCapped$create(MOBCAP_CREATURES, GameRules.Category.MOBS, IntegerGameRuleAccessor.MobCapped$create(10));
+        MobCapped$create(MOBCAP_AMBIENT, GameRules.Category.MOBS, IntegerGameRuleAccessor.MobCapped$create(15));
+        MobCapped$create(MOBCAP_AQUATIC_CREATURE, GameRules.Category.MOBS, IntegerGameRuleAccessor.MobCapped$create(5));
+        MobCapped$create(MOBCAP_AQUATIC_AMBIENT, GameRules.Category.MOBS, IntegerGameRuleAccessor.MobCapped$create(20));
+
+        MobCapped$create(PER_PLAYER_MOBCAP, GameRules.Category.MOBS, BooleanGameRuleAccessor.MobCapped$create(false));
+
+   }
+}
\ No newline at end of file
diff --git a/src/main/java/mod/linguardium/mobcapped/mixin/SpawnHelperInfoMixin.java b/src/main/java/mod/linguardium/mobcapped/mixin/SpawnHelperInfoMixin.java
new file mode 100644
index 0000000..4bf52d0
--- /dev/null
+++ b/src/main/java/mod/linguardium/mobcapped/mixin/SpawnHelperInfoMixin.java
@@ -0,0 +1,55 @@
+package mod.linguardium.mobcapped.mixin;
+
+import it.unimi.dsi.fastutil.objects.Object2IntOpenHashMap;
+import mod.linguardium.mobcapped.helpers.SpawnHelperInfoInterface;
+import net.minecraft.entity.EntityType;
+import net.minecraft.entity.SpawnGroup;
+import net.minecraft.entity.mob.MobEntity;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.SpawnHelper;
+import net.minecraft.world.chunk.Chunk;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(SpawnHelper.Info.class)
+public abstract class SpawnHelperInfoMixin implements SpawnHelperInfoInterface {
+
+    @Shadow protected abstract boolean isBelowCap(SpawnGroup group);
+
+    @Shadow
+    @Final
+    private int spawningChunkCount;
+
+    @Shadow
+    @Final
+    private Object2IntOpenHashMap<SpawnGroup> groupToCount;
+
+    @Shadow
+    protected abstract boolean test(EntityType<?> type, BlockPos pos, Chunk chunk);
+    @Shadow
+    protected abstract void run(MobEntity entity, Chunk chunk);
+
+    @Override
+    public boolean MobCapped$checkBelowMobCap(SpawnGroup spawnGroup) {
+        return isBelowCap(spawnGroup);
+    }
+
+    @Override
+    public boolean MobCapped$isBelowCap$CustomCapacity(SpawnGroup group, int capacity, int chunkArea) {
+        int i = capacity * this.spawningChunkCount / chunkArea;
+        return this.groupToCount.getInt(group) < i;
+    }
+
+    @Override
+    public boolean PublicTest(EntityType<?> type, BlockPos pos, Chunk chunk) {
+        return this.test(type,pos,chunk);
+    }
+
+    @Override
+    public void PublicRun(MobEntity entity, Chunk chunk) {
+        this.run(entity,chunk);
+    }
+}
diff --git a/src/main/java/mod/linguardium/mobcapped/mixin/SpawnHelperMixin.java b/src/main/java/mod/linguardium/mobcapped/mixin/SpawnHelperMixin.java
new file mode 100644
index 0000000..b870352
--- /dev/null
+++ b/src/main/java/mod/linguardium/mobcapped/mixin/SpawnHelperMixin.java
@@ -0,0 +1,113 @@
+package mod.linguardium.mobcapped.mixin;
+
+import mod.linguardium.mobcapped.helpers.SpawnHelperInfoInterface;
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.SpawnGroup;
+import net.minecraft.entity.mob.MobEntity;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.util.math.Box;
+import net.minecraft.world.GameRules;
+import net.minecraft.world.SpawnHelper;
+import net.minecraft.world.biome.Biome;
+import net.minecraft.world.chunk.WorldChunk;
+import net.minecraft.world.gen.StructureAccessor;
+import net.minecraft.world.gen.chunk.ChunkGenerator;
+import org.spongepowered.asm.mixin.Final;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.*;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.Random;
+
+import static mod.linguardium.mobcapped.NewGameRules.*;
+import static net.minecraft.world.SpawnHelper.spawnEntitiesInChunk;
+
+@Mixin(SpawnHelper.class)
+public abstract class SpawnHelperMixin {
+
+    @Shadow
+    @Final
+    private static int CHUNK_AREA;
+
+    @Shadow @Final private static SpawnGroup[] SPAWNABLE_GROUPS;
+
+    @Shadow
+    private static Biome.SpawnEntry pickRandomSpawnEntry(ServerWorld serverWorld, StructureAccessor structureAccessor, ChunkGenerator chunkGenerator, SpawnGroup spawnGroup, Random random, BlockPos blockPos) {
+        return null;
+    }
+    @ModifyConstant(method="spawn",constant = @Constant(intValue = 0, ordinal = 0))
+    private static int DisableVanillaMobSpawn(int zero) {
+        return SPAWNABLE_GROUPS.length;
+    }
+
+    @Inject(at=@At(value="INVOKE",target="Lnet/minecraft/util/profiler/Profiler;pop()V"),method="spawn")
+    private static void spawngroups(ServerWorld world, WorldChunk chunk, SpawnHelper.Info helperInfo, boolean spawnAnimals, boolean spawnMonsters, boolean shouldSpawnAnimals, CallbackInfo info) {
+        boolean perPlayerMobCap = world.getGameRules().getBoolean(PER_PLAYER_MOBCAP_KEY);
+        for (SpawnGroup spawnGroup : SPAWNABLE_GROUPS) {
+            GameRules.Key<GameRules.IntRule> capKey = null;
+            switch(spawnGroup) {
+                case MONSTER:
+                    capKey=MOBCAP_MONSTERS_KEY;
+                    break;
+                case CREATURE:
+                    capKey=MOBCAP_CREATURES_KEY;
+                    break;
+                case AMBIENT:
+                    capKey=MOBCAP_AMBIENT_KEY;
+                    break;
+                case WATER_CREATURE:
+                    capKey=MOBCAP_AQUATIC_CREATURE_KEY;
+                    break;
+                case WATER_AMBIENT:
+                    capKey=MOBCAP_AQUATIC_AMBIENT_KEY;
+                    break;
+            }
+            if (capKey == null)
+                continue;
+            int mobcap = world.getGameRules().getInt(capKey);
+            if ((spawnAnimals || !spawnGroup.isPeaceful()) && (spawnMonsters || spawnGroup.isPeaceful()) && (shouldSpawnAnimals || !spawnGroup.isAnimal()) && ( ((SpawnHelperInfoInterface)helperInfo).MobCapped$isBelowCap$CustomCapacity(spawnGroup,mobcap,CHUNK_AREA) || perPlayerMobCap)) {
+                spawnEntitiesInChunk(spawnGroup, world, chunk, ((SpawnHelperInfoInterface) helperInfo)::PublicTest, ((SpawnHelperInfoInterface) helperInfo)::PublicRun);
+            }
+        }
+    }
+
+    @Redirect(at=@At(value="INVOKE",target="Lnet/minecraft/world/SpawnHelper;pickRandomSpawnEntry(Lnet/minecraft/server/world/ServerWorld;Lnet/minecraft/world/gen/StructureAccessor;Lnet/minecraft/world/gen/chunk/ChunkGenerator;Lnet/minecraft/entity/SpawnGroup;Ljava/util/Random;Lnet/minecraft/util/math/BlockPos;)Lnet/minecraft/world/biome/Biome$SpawnEntry;"),method="spawnEntitiesInChunk(Lnet/minecraft/entity/SpawnGroup;Lnet/minecraft/server/world/ServerWorld;Lnet/minecraft/world/chunk/Chunk;Lnet/minecraft/util/math/BlockPos;Lnet/minecraft/world/SpawnHelper$Checker;Lnet/minecraft/world/SpawnHelper$Runner;)V")
+    private static Biome.SpawnEntry playerCap(ServerWorld serverWorld, StructureAccessor structureAccessor, ChunkGenerator chunkGenerator, SpawnGroup spawnGroup, Random random, BlockPos blockPos) {
+        if (serverWorld.getGameRules().getBoolean(PER_PLAYER_MOBCAP_KEY)) {
+            GameRules.Key<GameRules.IntRule> capKey = null;
+            switch(spawnGroup) {
+                case MONSTER:
+                    capKey=MOBCAP_MONSTERS_KEY;
+                    break;
+                case CREATURE:
+                    capKey=MOBCAP_CREATURES_KEY;
+                    break;
+                case AMBIENT:
+                    capKey=MOBCAP_AMBIENT_KEY;
+                    break;
+                case WATER_CREATURE:
+                    capKey=MOBCAP_AQUATIC_CREATURE_KEY;
+                    break;
+                case WATER_AMBIENT:
+                    capKey=MOBCAP_AQUATIC_AMBIENT_KEY;
+                    break;
+            }
+            if (capKey != null) {
+                int mobCap = serverWorld.getGameRules().getInt(capKey);
+                double despawnRange = spawnGroup.getImmediateDespawnRange();
+                for (ServerPlayerEntity player : serverWorld.getPlayers(player -> player.squaredDistanceTo(blockPos.getX(), blockPos.getY(), blockPos.getZ()) < despawnRange*despawnRange)) {
+                    Box searchBox = new Box(player.getBlockPos()).expand(spawnGroup.getImmediateDespawnRange());
+
+
+                    if (serverWorld.getEntities((Entity)null,searchBox, entity -> (entity instanceof MobEntity) && entity.getType().getSpawnGroup().equals(spawnGroup) && player.getBlockPos().getSquaredDistance(entity.getX(),entity.getY(),entity.getZ(),false) < despawnRange * despawnRange && !((MobEntity) entity).isPersistent()).size() >= mobCap) {
+                        return null;
+                    }
+                }
+            }
+        }
+        return pickRandomSpawnEntry(serverWorld, structureAccessor, chunkGenerator, spawnGroup, serverWorld.random, blockPos);
+    }
+}
diff --git a/src/main/resources/assets/minecraft/lang/en_us.json b/src/main/resources/assets/minecraft/lang/en_us.json
new file mode 100644
index 0000000..4eab5d8
--- /dev/null
+++ b/src/main/resources/assets/minecraft/lang/en_us.json
@@ -0,0 +1,8 @@
+{
+  "gamerule.mobCapAmbient": "Ambient Mob Cap",
+  "gamerule.mobCapAquaticAmbient": "Ambient Water Mob Cap",
+  "gamerule.mobCapAquaticCreature": "Water Creature Mob Cap",
+  "gamerule.mobCapCreatures": "Creature Mob Cap",
+  "gamerule.mobCapMonsters": "Monster Mob Cap",
+  "gamerule.mobCapPerPlayer": "Per Player Mob Cap"
+}
\ No newline at end of file
diff --git a/src/main/resources/assets/mobcapped/icon.png b/src/main/resources/assets/mobcapped/icon.png
new file mode 100644
index 0000000..4114fe3
Binary files /dev/null and b/src/main/resources/assets/mobcapped/icon.png differ
diff --git a/src/main/resources/fabric.mod.json b/src/main/resources/fabric.mod.json
new file mode 100644
index 0000000..9aaf7dd
--- /dev/null
+++ b/src/main/resources/fabric.mod.json
@@ -0,0 +1,29 @@
+{
+  "schemaVersion": 1,
+  "id": "mobcapped",
+  "version": "${version}",
+  "name": "MobCapped",
+  "description": "modifiable mob caps",
+  "authors": [
+    "Linguardium"
+  ],
+  "contributors": [],
+  "contact": {},
+  "license": "MIT",
+  "icon": "assets/mobcapped/icon.png",
+  "environment": "*",
+  "entrypoints": {
+    "main": [
+      "mod.linguardium.mobcapped.Main"
+    ],
+    "client": [],
+    "server": []
+  },
+  "mixins": [
+    "mobcapped.mixins.json"
+  ],
+  "depends": {
+    "fabricloader": ">=0.8.0",
+    "fabric": ">=0.15"
+  }
+}
\ No newline at end of file
diff --git a/src/main/resources/mobcapped.mixins.json b/src/main/resources/mobcapped.mixins.json
new file mode 100644
index 0000000..f098ba0
--- /dev/null
+++ b/src/main/resources/mobcapped.mixins.json
@@ -0,0 +1,17 @@
+{
+  "required": true,
+  "package": "mod.linguardium.mobcapped.mixin",
+  "compatibilityLevel": "JAVA_8",
+  "mixins": [
+    "BooleanGameRuleAccessor",
+    "IntegerGameRuleAccessor",
+    "RegisterGameRule",
+    "SpawnHelperInfoMixin",
+    "SpawnHelperMixin"
+  ],
+  "client": [],
+  "server": [],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}
\ No newline at end of file