Calador

Fey Ancestry. Calador has advantage on saving throws against being Charmed, and magic can’t put him to sleep.

Ghoulish Vitality. When Calador is reduced to 0 hp he is knocked unconscious but not killed. At the start of his next turn he regains 14 (4d6) hp and wakes up. He loses this ability if the Bone of Doresain is destroyed.

Spellcasting: Calador is a 3rd-level spellcaster. His spellcasting ability is Intelligence (spell save DC 14, +6 to hit with spell attacks). He has the following wizard spells prepared:

Cantrips (at will):  Fire Bolt, Light

1st level (3 slots): Mage Armor, Magic Missile, Shield

2nd level (1 slots): Misty Step, Suggestion

Bone Club Melee Weapon Attack. +6 to hit, reach 5 ft., one creature. Hit: 7 (1d6 + 4) bludgeoning damage.

Claw Melee Attack. +5 to hit, reach 5 ft., one creature. Hit: 5 (1d4 + 3) slashing damage.

Mind Rend Ranged Attack. (Recharge 5-6): A wave of madness flows out from the Bone. All creatures within 15 ft. must make a DC 14 Charisma save or take 7 (2d6) psychic damage.

Create Ghoul (once per day): Calador creates a ghoul from the body of a dead humanoid within 60 ft.The Ghoul is under Calador's command and will obey simple instructions, but the control is very weak and it will always tend to act on its violent nature. For details, see The Bone of Doresain.