Bill Cipher

Deal Maker: Bill can add +5 to Cha. checks and saving throws three times per long rest.

Spellcasting: Bill is a 20th-level spellcaster. Its spellcasting ability is Streangth (spell save DC: 7, +5 to hit with spell attacks). Bill  has following sorcerer spells prepared:

Cantrips (at will): Blade Ward, Fire bolt, Friends, Shocking Grasp, True Strike, Chill Touch.

1st level (5 slots): Burning Hands, Charm Person, Disguise Self, False Life, Sleep.

2nd level (5 slots): Alter Self, Blindness/Deafness, Darkness, Levitate, Shatter, Phantasmal Force, Enhance Ability.

3rd level (4 slots): Counterspell, Fly, Hypnotic Pattern, Dispel Magic, Stinking Cloud.

4th level (3 slots): Banishment, Dimension Door, Polymorph

5th level (3 slots): Animate Objects, Dominate Person, Telekenisis

6th level (1 slot): Move Earth, Circle of Death.

7th level (1 slot): Plane Shift.

8th level (1 slot): Dominate Monster.

9th level (1 slot): Meteor Swarm. 

GOD OF DESTRUCTION: Once per long rest, Bill can point at a structure that is one ton or less, the structure will crumble to the ground. Any beings in the structure must make a Dex. saving throw above 15, or they are trapped inside.

HEEEELLLLOOOO: If a character is within 50ft. of Bill, but cannot see him directly, Bill can choose to have a distorted creepy version of his voice whisper in that character's ear "HHHHEEEELLLLLOOOO" That character is now frozen in fear, and they cannot move for 5 minutes.

I SEE ALL: For 10 minutes, Bill has X-Ray vision 5 times per long rest. Any character nearby must make above 12 on an int. saving throw in order for Bill to not see through their clothes. 

FEAR ME : Twice per long rest, Bill can point at a being. They will fall to the ground, and stay put for ten minutes. They will take 10d4 Psychic damage. They are traumatized.

Cane smack: +5 to hit, reach 5ft., 1 target. Hit:  2d4 + 1) bludgeoning damage. 

Eye beam: +10 to hit, range 50 ft., 2-3 target. Hit: (5d6 + 5) Psychic damage. The being who is hit is traumatized.

OW!! I JUST REGENERATED THAT!! If a player wishes to stab Bill in the eye with whatever means possible, they must make 17 or above on a dexterity check. If succeeded the player does their damage, without rolling to hit, Bill swats the player off of his eye. They take 10 damage, Bill is now prone, until his next turn. On Bill's next turn, he can add 5 to any of his attacks. If the player fails the Dex. check, Bill notices what they were doing, and gets a free attack on the character who attempted the check.