Spellcasting.Vjangesh is a 100th level spellcaster. Its spellcasting ability is death (spell save 25), it has the following spells prepared 

All fire spells

Multiattack: Vjangesh performs 2 slap attacks, and 1 bite, it can replace bite with swallow.

Slap: Melee Weapon Attack:  reach 15 ft., 1 target. Hit: 300  bludgeoning damage.                                                                   

Bite: range 15 ft., 1 target. Hit: 700 piercing damage.

Swallow:every turn after being swallowed you take 100 damage 

Upgraded Reflective Carapace: every time he is hit with a spell the person who attacked Vjangesh must do a strength check of d20 or higher or Vjangesh will take no damage 

Nat 1 slayer: if he gets a nat 1 he rolls a attack roll so attack the nat 1 and if he gets a 10 or higher he can reroll the thing he rolled a nat 1 on

Second phase: when he dies it causes another battle to begin with his second form

Slap

Move

Spell

Megalomaniac: Create a ring or fire that hits you if your in it and stays for 5 turns (150 damage)