Cambion of Graz’zt

Fiendish Blessing. The AC of the cambion includes its Charisma bonus.

Joy from Pain. Whenever the cambion suffers a critical hit, it can make one melee weapon attack as a reaction.

Master of Pleasures. As a reaction when the cambion takes damage, it can magically grant 5 temporary hit points to itself and up to three allies within 30 feet of it.

Innate Spellcasting. The cambion’s spellcasting ability is Charisma (spell save DC 16). The cambion can innately cast the following spells, requiring no material components:

3/day each: alter self, command 

1/day each: fear, plane shift (self only)

Multiattack. The cambion makes two melee attacks or uses its Fire Ray twice.

Flayer Greatsword. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage plus 3 (1d6) acid damage.

Fire Ray. Ranged Spell Attack: +7 to hit, range 120 ft., one target. Hit: 10 (3d6) fire damage.

Fiendish Charm. One humanoid the cambion can see within 30 ft. of it must succeed on a DC 16 Wisdom saving throw or be magically charmed for 1 day. The charmed target obeys the cambion’s spoken commands. If the target suffers any harm from the cambion or another creature or receives a suicidal command from the cambion, the target can repeat the saving throw, ending the effect on itself on a success. If the target’s saving throw is successful, or if the effect ends for it, the creature is immune to the cambion’s Fiendish Charm for the next 24 hours.