Balegoren

Deities knowledge: Every time a creature rolls any die Balegoren may role a six sided die. The result of the six sided die role will be subtracted from the creatures role.

Spellcasting.  Balegoren is a 20th-level spellcaster. Its spellcasting ability is intelligence (spell save DC #, +# to hit with spell attacks). Balegoren has following [class name] spells prepared:
Cantrips (at will): [acid splash], [flame bolt] 
1st level (5 slots): [create or destroy water], [Hellish Rebuke]

2nd level (5 slots): [Blindness/Deafness], [detect thoughts], [scorching ray]

3rd level (5 slots): [fire ball]

4th level

5th level

6th level (4 slots): [disintegrate]

7th level (4 slots): [reverse gravity]

8th level

9th level (3 slots): [wish], [time stop]

Multi-attack: Balegoren may attack four times once with his bite two with his arms and one with his breath

Bite: Melee weapon attack: +20 to hit, reach 8 ft., one target. Hit: 50 (6d14 + 3) peircing damage. 

Arms: Melee weapon attack: +20 to hit reach 20 ft. two targets Hit: 40(4d20+0) bludgeoning damage.

Breath fire: Ranged Weapon Attack:  Balegoren exhales fire in a 70-foot cone. Each creature in that area must make a DC 20 Dexterity saving throw, taking 90 (3 6d10) fire damage on a failed save, or half as much damage on a successful one.

Snap back: if Balegoren takes damage he will attack with his bite, but the damage is halved.

Legendary resistance: (2/day) If Balegoren would fail a saving throw he may save himself.

BURN INSECT:  Balegoren may role a d20. If he gets a 15 or higher he may target one player. Their hit points are halved and they lose 70 hit points.