Belial

Devil’s Sight. Magical darkness doesn’t impede Belial's darkvision.

Magic Weapons. Belial's weapon attacks are magical. Belial has the following: +3 fleshgrinding vile ranseur, ring of protection +3.

Fear aura. At the end of Belial's turn each creature within 20 ft must make a dc 23 Charisma save or be frightened for 1 minute. 

Innate Spellcasting. Belial’s innate spellcasting ability is Charisma ( Dc 24). He can innately cast the following spells, requiring no material components:

• At will: charm monster, darkness, geas, dispel magic, teleport, locate creature, locate object, major image, see invisibility, suggestion
• 1/day each: dominate monster

Legendary Resistance (3/Day). If Belial fails a saving throw, he can choose to succeed instead.

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

Regeneration. Belial regains 20 hit points at the start of his turn. If he takes radiant damage, this trait doesn’t function at the start of his next turn. Belial dies only if he starts his turn with 0 hit points and doesn’t regenerate.

Multi attack. Belial makes a fleshgrinding vile ranseur attack or two claw attacks. 

Fleshgrinding vile ranseur. Melee Weapon Attack: +17 to hit, reach 10 ft., 1 target. Hit: 27 (4d8 + 11) Piercing damage and the target must make a dc 23 Constitution saving throw or for the next 1 hour the creature has a -1 penalty to all saves and attack rolls (this does stack) and can only be cursed by greater restoration and similar magic, 

Claw. Melee Weapon Attack: +13 to hit, reach 5 ft., 1 target. Hit: 10 (1d6 + 7) Slashing damage. 

Summon Devil (1/Day) Belial summons 2d4 bearded devils or 1d4 barbed devils. A summoned devil appears in an unoccupied space within 60 feet of Belial, acts as an ally of Belial, and can’t summon other devils. It remains for 1 minute, until Belial dies, or until its summoner dismisses it as an action

Belial 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. Belial regains spent legendary actions at the start of his turn.

Analyze arcane (Costs 1 Actions). Belial looks at one creature with any spell casting ability within 60 ft and they make an insight check DC 20 and on a success belial gains a +5 bonus on saving throws against one spell level of their choice. 

Crippling lash (Costs 2 Actions). Belial makes a fleshgrinding vile ranseur attack. 

My loves sting (Costs 3 Actions). One creature of belial's choice must make a dc 24 Charisma save or take 40 (8d10) psychic damage and be charmed for 1d4 rounds.