Troll Mystic (5e Creature)
From D&D Wiki
Large giant, chaotic evil
Regeneration. The troll regains 10 hit points at the start of its turn. If the troll takes acid or fire damage, this trait doesn't function at the start of the troll's next turn. The troll dies only if it starts its turn with 0 hit points and doesn't regenerate.
Cantrips (at will): fire bolt, light, mage hand, prestidigitation, ray of frost
Multiattack. The troll makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) piercing damage.
Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.
Trolls have little understanding of magic, seeing it as a strange and confusing tool for weaklings and cowards. As such, trolls that use magic are very rare, and in all likelihood, those that use it have little more comprehension of it than those trolls that don't. Troll mystics take an almost shamanistic role among trolls, who view it with a mixture of fear and awe. The thought of an ordinary troll is already unsettling enough to most civilised folk: a troll with magic is a horrible concept indeed.