COPY_OF_Demon of Betrayal

Spellcasting. The Demon of Betrayal is a 20-level spellcaster. Its spellcasting ability is wisdom (spell save DC 25 , +23 to hit with spell attacks). The Demon of Betrayal has following spells prepared: 

Cantrips (at will): all spells 
1st level (# slots): all spells

2nd level (# slots): all spells

3rd level (# slots): all spells

4th level (# slots): all spells

5th level (# slots): all spells

6th level (# slots): all spells

7th level (# slots) all spells

8th level (# slots): all spells

9th level (# slots): all spells (excluding wish)

legendary Resistances. 5/Day, 5 times a day The Demon of Betrayal can choose to succeed a saving throw instead of failing.

Actions. The Demon of Betrayal makes 2 Demon Claw attacks and 1 Necrotic Breath attack.

Demon claw. Melee Weapon Attack: +17 to hit, reach 25 ft., 1 target. Hit:  22 (2d10 + 12) slashing damage.

Necrotic Breath. Ranged Weapon Attack: +19 to hit, range 30/450 ft., 1 target. Hit: 40 (4d12 + 16) necrotic damage.

Bonus Actions:

Demon Step: Teleport to a place within 200ft leaving a magma like residue that if enemies within 20ft of the centre point of the magma succeeds a 18 DC dexterity saving throw will take half of 8d4 fire damage, but if on a fail, the creature takes full damage and is immobile.

Reaction:

Opportunity Attack: when an enemy leaves your melee range without taking the disengage action, the Demon of Betrayal makes one melee attack.

Reaction based spell: whenever the enemy uses an attack or spell, the Demon of Betrayal can cast a spell that can be used on a reaction.

Legendary actions: 3 replenishes on turn.

Summon Demon Warrior (Costs 2 Actions). The Demon of Betrayal summons a random Demon Warrior under his control. Roll 1d100 to determine the monster. 1-10 Imp, 11-20 Nightmare (level 1), 21-30 Rakshaa, 31-40 Bearded Devil, 41-50 Spirit Naga, 51-60 Barbed Devil, 61-70 Barlos, 71-80 Vrock, 81-90 Ice Devil, 91-100 Pit Fiend.

Movement (Costs 1 Actions). the Demon of Betrayal moves up to 60ft.

Mythic Action. 1 replenishes on turn.

Plane and Time Shift (Costs 1 Actions). Plane/Time Shift causes the Demon of Betrayal and any creatures within 100ft of him to shift through space and time.