Aged King of Ochos

Magic Equipment: The King of Ochos has the staff of Perished and the Blade of Afterlife. 

Spellcasting. The [King of Ochos] is a #15-level spellcaster. His spellcasting ability is [20] (spell save DC #18, +10# to hit with spell attacks). The [King of Ochos] has following [wizard] spells prepared: 
Cantrips (at will): [fire bolt] Damage: 3d10 fire dmg, [clap of thunder] Damage: 3d6 thunder dmg, [control flames], [toll dead] 3d8 necronic dmg (If opponent is at full health; if they are not it is 3d12), [Minor illusion]

1st spell level (#4 slots): [Burning hands] Damage: 3d6 fire dmg (dex save), [Magic Missle] Damage: 1d4+1 per missle, [healing wound], [false life] (1d4+4 temporary hit points), [Fog Cloud]

2nd spell level (#3 slots): [Scorching Ray] 2d6 fire dmg per ray, [misty step], [Long Strider]

3rd spell level (#3 slots): [Fire Ball] 8d6 fire dmg, [Haste], [Lightning Bolt] 8d6 lightning dmg, [Wicked Kindling] (Turns non magic fire into magic fire that he controls and does 2d6 force dmg)

4th spell level (#3 slots): [Phantom Steed], [wall of fire] , [fantasmal killer]

5th spell level (#2 slots): [Bigbuy's Hand], [Dominate Person]

6th spell level (#1 slot): [Chain Lightning] 10d8 lightning damage (dex save), [Infernal Fling] 7d12 fire dmg, [Blazing Impale] 5d10 fire dmg (distributed between two targets)

7th spell level (#1 slot): [Fire dart] 4d10+2 fire dmg; 2d6 force damage

Blade of Afterlife: Melee Weapon Attack: #+6 to hit, reach #10 ft., #1 target. Hit: #18 (#3d6 + #7) [force] damage. 

Infernal Plate: Bentlee becomes engulfed in a plate of howling flames in response to taking a melee weapon attack, the attacker takes 1d4 fire damage.

Cast Cantrip (Costs #1 Action). The King of Ochos may cast a cantrip

Burning Grasp (Costs #1 Action). Bentlee performs a melee spell attack, dealing 3d6 fire damage (+2 to hit)

Catastrophic Fatigue (Costs #1 Action). On the next opponent's turn, they lose half their speed and if they have immunity to fire, they lose that ability.