blood troll

Keen Smell. The troll has advantage on Wisdom (Perception) checks that rely on smell.

Regeneration. The troll regains 10 hit points at the start of its turn. If the troll takes 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. In addition also restoring two hit dice at the start of each round ( does not restore hit points but can be used to cast spells)

Multiattack. The troll makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 5) piercing damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 5) slashing damage.

Longsword. Melee Weapon Attack:  +9 to hit, reach 5 ft., one target. Hit: 11 (2d8 + 5) slashing damage.

Innate Spellcasting. innate spellcasting ability is Constitution (spell save DC 17). sacrificing one of his hit dice to do a spell like effect. Equivalent to a level 5 sorcerer for spells