Grasping Tentacles

10th-level Fathomless Feature

You learn the spell Evard's Black Tentacles. It counts as a warlock spell for you, but it doesn't count against the number of spells you know. You can also cast it once without a spell slot, and you regain the ability to do so when you finish a long rest.

Whenever you cast this spell, your patron's magic bolsters you, granting you a number of temporary hit points equal to your warlock level. Moreover, damage can't break your Concentration on this spell.