BANE

Crimson rite (blood-hunter ability) - Adds 2d6 of Fire, Lightning, and/or poison Damage. (looses 1 hp each time this ability is activated)

• If BANE deals damage to a creature while Crimson rite is active, BANE gains 2d6 of health.

Spell-casting. BANE is a 20th level spell-caster. Its spell-casting ability is [Wisdom] (spell save DC 16, +12 to hit with spell attacks).

BANE has following magic abilities prepared: (no spell slots limit)

• thunderclap 
• charm person
• non detection  
• mirror image
• counter spell
• banishment 
• dimension door
• anti gravity 
• prestidigitation

Brute boost : BANE can use a bonus action to cast an ability boost on himself. this gives BANE +30 speed, +15 on all physical damage and strength, and +20 to all rolls on Athletic and Acrobatic based abilities and/or movements.

Dark Matter grip : for one bonus action BANE can cast dark matter grip. Dark matter grip allows BANE to climb, run across water (or difficult terrain) and power jump up to 60ft. BANE can also use this ability to grapple and hold a enemy.

Actions:

• Attack, cast spell, hide, improvised interaction, disengage and Rage.
• If BANE hits a opponent with a Critical strike, He gets an opportunity attack as an extra bonus action.
• BANE has (2) bonus actions that can be held until he see the timing as fit.
• Multiattack

Attacks:

• Greatsword : +10 to hit, 2d8 +6 slashing
• Dark Matter Blast : +10 to hit, 2d10 +5 Force
• Dark matter Daggers : +10 to hit, 3d6 +2 piercing (thrown 30-120ft)
• Unarmed attack : +10 to hit, 12 bludgeoning 

Reactions:

Opportunity Attack

Vengeance - When an attempted attack on BANE fails or deals less than 50 damage, BANE makes a vengeance attack. (Attacks who attacked him) Using any 1 spell or melee attack as long as the creature is within his movement speed.

Add insult to injury - IF a creature attempts to use any sort of Magic / Spell that would interfere with BANE's spell-casting ability, He may cast Rebuke (Counter Spell) as a response.

Spirit of Death (Costs 3 Actions). BANE GAINS IMMUNITY TO ALL DAMAGE DEALT TO HIM THIS TURN. Resistance to all damage the following turn and Resistance to all non-magical damage the turn after that. 

BANE becomes Enraged (+15 to hit) (+20 to all damage dealt [per hit])

This Legendary Action lasts for 3 turns. after those 3 turns BANE becomes vulnerable to piercing and slashing damage for 1 turn.