Viljim

Troll Regeneration. Viljim regains 15 hitpoints at the start of each of his turns. This trait does not function if Viljim doesn't have at least 1 hitpoint at the start of his turn. 

Witch Doctor. Viljim is a Chultan Troll Witchdoctor, and can cast any cantrip he knows as a bonus action. Cantrips cast this way cannot be upcast. 

Spellcasting. Viljim is an 8th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 14, +6 to hit with spell attacks). Viljim has the following spells prepared:

Cantrips (at will): light, shocking grasp, spare the
    dying, true strike, catapult
1st level (4 slots): absorb elements,
    sleep, shield
2nd level (3 slots): Branding Smite (Necrotic), silence, lesser restoration, Wither and Bloom, zone of truth
3rd level (3 slots): vampiric touch, Call Lightning
    revivify, fireball
4th level (2 slots): Staggering Smite, Stoneskin 

Battleaxe. Melee Weapon Attack: +8 to hit, reach 5 ft., 1 target. Hit: 12 slashing damage. 

Spellcasting:

Cantrips (at will): light, shocking grasp, spare the
    dying, true strike, catapult
1st level (4 slots): absorb elements,
    sleep, shield
2nd level (3 slots): Branding Smite (Necrotic), silence, lesser restoration, Wither and Bloom, zone of truth
3rd level (3 slots): vampiric touch, Call Lightning
    revivify, fireball
4th level (2 slots): Staggering Smite, Stoneskin