Provide a property on items to determine whether concentration on said item can be broken

[krbz999]

Related to #3028.

The Fathomless Warlock is granted a spell at a certain level that requires concentration but whose concentration cannot be broken.

We should provide a property on items to describe this, such that when an actor takes damage they will not be needlessly prompted for a saving throw to maintain concentration.

[Rabulias]

Not sure if this should be a separate feature request, but would it be possible to set a different damage amount threshold (either for a specific class feature (for all the actor's spells) or a particular spell/item)? Something like Solasta's Flawless Concentration feat, where you do not need to make a Concentration saving throw unless you take more than 10 points of damage.

[krbz999]

Something like Solasta's Flawless Concentration feat

What material is this from?

[Rabulias]

What material is this from?

It is from the computer RPG game, Solasta: Crown of the Magister, which used the SRD and added a number of custom feats, spells, and subclasses. They also produced a Kickstarter exclusive handbook with D&D rules.