Asriel Dreemurr, God Of Hyperdeath

Literal God. Asriel cannot be killed, he can only be escaped or reasoned with. He actually has infinite hitpoints.

Spellcasting. The God of Hyperdeath is a 20-level spellcaster. His spellcasting ability is Charisma (spell save DC 18, +5 to hit with spell attacks). The God of Hyperdeath has the following sorcerer spells prepared:
3rd level (Infinite slots):  Counterspell, Dispel Magic, Fear, Hypnotic Pattern, Lightning Bolt
4th level (Infinite slots): Confusion, Blight
6th level (Infinite slots): Chain Lightning, Disintegrate, Circle of Death, Sunbeam
7th level (Infinite slots): Fire Storm, Prismatic Spray
8th level (Infinite slots):  Power Word Stun, Sunburst
9th level (Infinite slots): Meteor Swarm, Power Word Kill, Wish

Star Shower. Stars fall from the sky. Every creature that Asriel can see must make a DC 15 Dexterity saving throw or take 70 (6d12 + 7) radiant damage.

Slash. Melee Weapon Attack: +5 to hit, reach 10 ft., up to 2 targets. Hit: 77 (6d12 + 14) radiant damage. Asriel attacks two targets once or one target twice.

Beam. Ranged Weapon Attack: +5 to hit, range 60 ft., 1 target. Hit: 77 (6d12 + 14) radiant damage.