Aries Gorefield (improved)

sleep paralysis. any creature that starts it's turn within 10 feet of Aries Gorefield must make a DC 20 constitution saving throw or be unconscious until the end of it's next turn.

Spellcasting.  Aries Gorefield is a 11th-level spellcaster. Its spellcasting ability is wisdom. spell save DC 20, +11 to hit with spell attacks.  Aries Gorefield has the following cleric spells prepared:
Cantrips (at will): sacred flame, word of radiance, toll the dead, resistance, guidance 

1st level (4 slots): command, guiding bolt, inflict wounds, shield of faith

2nd level (3 slots): spiritual weapon, hold person, blindness/deafness

3rd level (3 slots): life transference, fast friends, animate dead

4th level (3 slots): guardian of faith, banishment, blindness/deafness

5th level (2 slots): insect plague, flame strike

6th level (1 slot): planar ally (an evil aligned variant of a celestial)

multiattack. Aries Gorefield performs up to 2 claw strikes and 1 wing strike.

claw strike. Melee  Attack: +11 to hit, reach 5 ft., 1 target. Hit: 60 (5d10 + 10) slashing damage. 

wing strike. melee Attack: +11 to hit, reach 10 ft., 2 targets. Hit: 60 (5d10 + 10) bludgeoning damage. additionally, the target of this attack must make a DC 12 strength saving throw or be knocked back 15 feet and knocked prone.

Aries Gorefield may take up to 1 bonus action per action it takes.

possession. Aries Gorefield, as a bonus action, may take control of the body of any unconscious humanoid creature within 30 feet of it. Aries Gorefield gains the strength and dexterity of the possessed creature, as well as gaining the target's AC, hit points and hit dice, and replacing it's attacks with those of the target's. it can use both it's own spells and any spells the target may have.

 superior multiattack. Aries Gorefield performs up to 3 claw strikes and 2 wing strikes.

end possession (costs 2 actions). Aries Gorefield ends a possession prematurely, paralyzing the possessed victim for 1 round and making Aries Gorefield reappear within 5 feet of the victim.

celestial summon (Costs 3 Actions). Aries Gorefield summons 3 random evil celestials from it's celestial army, which it controls the actions of. after 1d6 rounds, the celestials vanish.