Vile Damage (5th Edition)

What follows are my 5e rules for Vile Damage, a type of damage originally outlined in the 3.0 Book of Vile Darkness. I have a post coming soon that will make some use of this, though be warned, it is something a little more "grimdark" that the usual stuff here. 
And so...


Vile damage represents harm so utterly abominable, so purely soaked with undiluted evil, that it simply cannot be healed naturally. In game terms, hit points or ability scores reduced by vile damage do not return over time, cannot be healed by spending hit dice, and can only be healed by magic within the area of an active Hallow spell, or if the healing is cast within 1 round of the target receiving a Lesser Restoration spell.