coysin

extremecasting . the coysin is trained in a special kind of spellcasting called extremecasting it allows the coysin to use spells that nearly no one else has achieved the coysin may use one of its turns to focus hard on this power allowing it to gain 20 points of spellcasting it can use ten of those points as a action to cast one of the spells on the spell list.

Spellcasting. The coysin is a 20-level spellcaster. Its spellcasting ability is CHA spell save DC 21, +14 to hit with spell attacks. The coysin has following spells prepared:
9th level : wish, power word kill, Meteor Swarm, time stop, gate,

wrath. red light starts poring out of the coysin than disappears all that is left is a faint red aura around it and its eyes turn blood red the coysin and all friendly creatures of the coysin within a 300 ft range of the coysin have advantage on all rolls and are immune to being charmed and frightened .

tail. Melee Weapon Attack: +11 to hit, reach 20 ft., 1 target. Hit:  31 4d10+7 bludgeoning  damage. 

Action light blast. RangedWeapon Attack:  the coysin opens its mouth and shoots out a blast of blinding light than starts turning in circles all creatures within 30 ft of the coysin must make a 21 DC dex save on a failed save that creature takes 6d12 radiant damage and is blinded until the end of its next turn on a successful save the creature takes half damage and isn't blinded 

extreme destruction. 3 actions. the coysin becomes a being of extreme power and destruction for the next 3 rounds the coysin is a challenge rating of 30 and is immune to all non magical damage and any nonmagical weapon brakes on contact and is resistant to all magical damage the coysin gains 50 extremecasting points and may use up to 30 of them at a time once 3 rounds is up the coysin goes back to normal