Apatheia

Innate Spellcasting. The apatheia's innate spellcasting ability is Charisma (spell save DC 16, +8 to hit with spell attacks). The apatheia can innately cast the following spells, requiring no somatic, verbal, or material components:

At will: darkness, hex, crown of madness, spider climb, ray of enfeeblement

3/day each: hold person, hunger of hadar, circle of death

1/day each: synaptic static, sleep (cast at 6th level)

Magic Resistance. The apatheia has advantage on saving throws against spells and other magical effects.

Multiattack. The apatheia makes an attack with any two combinations of the attack options below.

Serpent's Bite. Melee Weapon Attack: +8 to hit, reach 15 ft., one target. Hit: 11 (2d6+4) piercing damage, and the target must succeed on a DC 15 Constitution Saving Throw or be poisoned until the start of the apatheia's next turn, as one of the poisonous serpents in the apatheia's lower body lashes out at a nearby creature.

Draining Touch. Melee Spell Attack: +8 to hit, reach 5 ft., one target. Hit: 11 (3d6) necrotic damage, and the apatheia regain hit points equal to half the amount of necrotic damage dealt.

Dark Bolt. Ranged Spell Attack: +8 to hit, reach 120 ft., one target. Hit: 13 (2d8 + 4) necrotic damage. The creature must succeed on a DC 16 Constitution Saving throw or be blinded until the start of the apatheia's next turn.

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

Darting Serpent. The apatheia can move up to twice its speed in a straight line. This movement still provokes attacks of opportunity.

Serpentine Fury. The aptheia's makes a serpent's bite attack.

Cast a Spell (Costs 2 actions). As a legendary action, the apatheia casts a spell with the casting time of an action.