Chaos King

Bad Nature. Cannot be reasoned with.

Spellcasting. The Chaos King is a 10-level spellcaster. Its spellcasting ability is Charisma (spell save DC 16, +8 to hit with spell attacks). The Chaos King has following spells prepared:
Cantrips (at will): [Fire Bolt], [Shocking Grasp], [Thorn Whip], [Ray of Frost], [Primal Savagery]

1st level (8 slots): [Magic Missile], [Shield], [Color Spray]

2nd level (5 slots): [Pyrotechnics], [Web]

Chaos King 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. Chaos King regains spent legendary actions at the start of his turn.

Spellcasting. Chaos King casts a spell.

Tail Attack (2 actions). Chaos King whips his tail at one target, that target makes a DC 16 Dexterity Saving Throw, on a failed save they take 68 (6d8) Piercing damage and become restrained, on a successful save they take half as much and don't become restrained. A creature can reroll the dex save for being restrained at the start of each of its turns.