Aphistus

Field of flames. its unique special trait is that it can at will have a 60ft field of flames around it that does d12 fire damage to all creatures in its in the field which includes sky and under ground. however local natural,plants, and random harmless animal like deer and the such aren't harmed and go up in flames. it turn this field off and on in but a instant.creature take  d12 fire at the start and end of their turns.

Multi atk. use can attack up to 4 times since it has 4 arms.

Lance of Misty Step. Melee Weapon Attack: +13 to hit, reach 15 ft., 1 target. Hit: 70 (6d10 + 10) [piercing/ slashing] damage. this weapon also its user to use misty step at will.

Mythril longsword +3(5slots per day). Melee Attack weapon: +13 to hit # target. Hit: 50 (5d6+ 20) [slashing] damage. is able to store magical spells like fire ball,fire wall,moon beam,shield,teleport in it.

Firestorm. it can use its reaction to make fire spin like blades around it in a 60 ft radius to do 2d20 fire/slashing damage. dc 21 dex check to save for have damage.

Fire destruction (Costs 1 Actions). it makes its body to become pure fire to make like a fire elemental. is able to move for 120ft in any direction. should a creature be in its path then said creature takes 2d6 fire damage and be pushed 10 ft and knocked prone.

Will of Aphistus(5 per day). should it fail a saving throw of check against it. it can choose to pass instead.

Hell Rain(costs full Turn). everything within 2 miles from must make dc 21 dex and dc 18 con save, as a the skies above become fire red and dark as fire balls fall from the sky like rain for 10d10 fire damage. dex save for half damage and should you fail the con save you are stunned and knocked prove as the shock waves knock you on to the ground.(Has to roll 18-20 on a d20 to get its Hell Rain back.)