Thurstwell Vanthampur (Revised)

Dark Devotion. Thurstwell has advantage on saving throws against being charmed or frightened.

Spellcasting. Thurstwell is a 9th-level spellcaster. His spellcasting ability is Wisdom (spell save DC 15, +5 to hit with spell attacks). He has the following cleric spells prepared:

Cantrips (at will): light, mending, sacred flame, spare the dying

1st level (4 slots): Shield of Faith, Command, healing word, Inflict Wounds

2nd level (3 slots): lesser restoration, Hold Person, prayer of healing, silence, spiritual weapon

3rd level (3 slots): Meld into Stone, crusader’s mantle, dispel magic, revivify, spirit guardians, Sending

4th level (3 slots): banishment, freedom of movement, Death Ward, Guardian of Faith

5th level (1 slot): Contagion, mass cure wounds, hold monster

Sacred Flame (Cantrip). Flame-like radiance descends on one creature Thurstwell can see within 60 feet of him. The target must succeed on a DC 15 Dexterity saving throw or take 9 (2d8) radiant damage, gaining no benefit from cover.

Unarmed Strike (Melee). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 1; bludgeoning damage.

Thrustwell Vanthumpur can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Thrustwell regains spent legendary actions at the start of its turn.

Cowardly retreat. Thrustwell takes a legendary action to move Disengage if in melee combat and move up to 30 feet. 

Command Fiend. His practice and time spent in the arcane workings of the Nine-hells have allowed him have some elements of control over the fiends he summoned. He takes a legendary action to allow ONE fiend of his choosing to take a movement and action.

Summon Tormentor (3 Action). In his dire state, Thrustwell can use all his legendary actions to release an experimental spell to summon a unique Bone Devil. The boned devil will not be under his influence and acts on its own will. Thrustwell may roll an arcana check (DC 20) to see if it knows its true name to take control of it.