Arabon Kahn

Legendary Resistance (3/Day). If the Arabon fails a saving throw, it can choose to succeed instead.

Soul core. Arabon has 200 souls that he can recover by taking the souls taken from creatures he's killed

Spellcasting. The [Arabon Kahn] is a 9-level spellcaster. Its spellcasting ability is [Charisma] (spell save DC 18, +8 to hit with spell attacks). The [Arabon Kahn] has following spells prepared:

At will: detect magic, mage hand, message, minor illusion

2/day each: fireball, fly, hold person, suggestion, wall of fire

1/day each: dominate person, etherealness, feeblemind

Multiattack. Arabon can make three attacks, only one can be made with his Dark spear attack.

Dark sword. Melee Weapon Attack: +11 to hit, reach 5 ft., 1 target. Hit: 18 (2d8 + 10) Slashing damage and 6 (3d4) Necrotic damage. On a hit the target must make a DC 16 Constitution saving throw, or have their maximum hit point reduced by the necrotic damage done. This effect lasts until a long rest is taken or Greater restoration is used on the effected. Healing spells of the similar quality will do the same.

Unarmed attack. Melee Weapon Attack: +9 to hit, reach 5 ft., 1 target. Hit: 9 (1d8 + 5) Bludgeoning damage and 4 (2d4) Piercing damage. 

Dark spear (Recharge 5–6). Arabon thrusts his Dark sword to shoot a 40-foot by 10-foot line. Each creature in the line must make a DC 18 Dexterity saving throw, taking 40 (8d10) necrotic damage and becomes stunned until the end of their next turn on a failed save, or half as much damage on a successful one.

Consume souls. As a bonus action, Arabon can burn up a number of souls to do one of the following. (30) to heal himself for 4d6+16, (10) to cast Flame blade, (40) to cast Death ward, (15) to cast Hold person, (35) to summon 1d4+2 Hell hounds.

Hellish rebuke 3/day. You point your finger, and the creature that damaged you is momentarily surrounded by hellish flames. The creature must make a Dexterity saving throw. It takes 4d10 fire damage on a failed save, or half as much damage on a successful one.

Counterspell 2/day. You attempt to interrupt a creature in the process of casting a spell. If the creature is casting a spell of 4th level or lower, its spell fails and has no effect. If it is casting a spell of 5th level or higher, make an ability check using your spellcasting ability. The DC equals 10 + the spell's level. On a success, the creature's spell fails and has no effect.

Shield 3/day. An invisible barrier of magical force appears and protects you. Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from magic missile.

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