Aspect of Bane

Eternal Tyrant (Recharges after a Short or Long Rest). If the Aspect of Bane would be reduced to 0 hit points, his current hit point total instead resets to 500 hit points, he recharges his Gauntlet of Tyranny, and he regains any expended uses of Legendary Resistance. Additionally, the aspect can now use the options in the "Mythic Actions" section for 1 hour. Award the party double the XP (310,000) for defeating the Aspect of Bane after his Eternal Tyrant activates.

Dominating Presence. When a creature ends its turn within 10 feet of the Aspect of Bane, it must make a DC 20 Wisdom Saving Throw, on a failure, the creature becomes frightened, taking 4d10 psychic damage on a success. Creatures can make the saving throw on the beginning of each of their turns. This only affects a creature once per day.

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

Innate Spellcasting. The Aspect of Bane is a 20th-level spellcaster. Its spellcasting ability is Charisma (spell save DC 26, +18 to hit with spell attacks). The Aspect of Bane has following spells prepared:

(3/long rest): Mental Prison, Synaptic Static, Dominate Person

(1/long rest): Psychic Scream

Multi-attack. The Aspect of Bane makes two punch attacks and one stomp attack. Or the Aspect of Bane makes three psychic weapon attacks

Punch. Melee Weapon Attack: +19 to hit, reach 10 ft., 1 target. Hit: (2d10 + 10) bludgeoning damage. 

Stomp. Melee Weapon Attack: +19 to hit, reach 5 ft., 1 target. Hit: (3d10 + 10) bludgeoning damage. If the target is a large or smaller creature, it is grappled (escape DC 22) and is restrained until this grapple ends. The aspect can have only one creature grappled this way at a time.

Psychic Weapons. The Aspect of Bane summons ethereal weapons and launches them at his foes. They can appear as spears, swords, axes, hammers, or whatever the Aspect of Bane desires. Ranged Weapon Attack: +18 to hit, range 60/120 ft., 1 target. Hit: (2d8 + 9) psychic damage.

Gauntlet of Tyranny (Recharges 5-6). The Aspect of Bane uses one of the following magic attacks with his gauntlet.

Power of Evil. The Aspect of Bane raises his gauntlet and unleashes forth dark power in a 150ft cone. Each creature in that area must make a DC 20 Dexterity saving throw, taking 10d10 necrotic damage on a failed save, or half as much damage on a successful one. If a creature is reduced to 0 hit points by this method, are turned to dust and any nonmagical items in their possession are destroyed.

Power of Hate. The Aspect of Bane spreads the fingers of his gauntlet apart and launches forth 5 skewering bolts of dark energy. These bolts slither through the air and pierce the enemies of the Aspect of Bane. A creature that is targeted by a single bolt must make a DC 24 Dexterity saving throw or take 2d8 necrotic damage, taking no damage on a success.

The Aspect of Bane 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. The Aspect of Bane regains spent legendary actions at the start of its turn.

Leave my sight! The Aspect of Bane grabs a large or smaller creature with his gauntlet and throws them like a ragdoll across the battlefield. Target creature makes a DC 24 Strength or Dexterity saving throw. On a failure, targeted creature is move 60 feet in any direction and takes 4d6 +10 bludgeoning damage and is knocked prone.

Kneel before me! Target creature makes a DC 24 Wisdom saving throw. On a failure, targeted creature takes 1d10 + 9 psychic damage and kneels, the creature is considered prone. On a success, targeted creature takes half the damage.

Run coward! (Costs 2 Actions). The Aspect of Bane kicks a creature like a ball. The Aspect of Bane makes a stomp attack. If the attack hits, targeted creature makes a DC 22 Strength saving throw. On a failure, creature is instead moved directly 40 feet away from the Aspect of Bane and takes an additional 4d6 bludgeoning damage and is also knocked prone. 

If the Aspect of Bane's Eternal Tyrant trat has activated in the last hour, he can use the options below as legendary actions.

I command the earth you walk upon! (Costs 2 Actions). The Aspect of Bane instills his will upon the earth, causing chains formed from stone to burst from the ground in a 15 by 100-foot line along the ground. Creatures within this area must make a DC 22 Dexterity saving throw or be restrained until the end of the round.

All will bow before me! (Costs 3 Actions). All creatures within 20 feet of the Aspect of Bane must make a DC 20 Wisdom saving throw. On a failure, creatures take 5d6 psychic damage and are stunned for one round, only taking half damage on a success.