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.
{
"name": "Grasping Tentacles",
"page": 72,
"level": 10,
"__prop": "subclassFeature",
"header": 2,
"source": "TCE",
"entries": [
"{@i 10th-level Fathomless feature}",
"You learn the spell {@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 {@status concentration} on this spell."
],
"className": "Warlock",
"classSource": "PHB",
"subclassSource": "TCE",
"subclassShortName": "Fathomless"
}