Basic Demon

Death Throes. When the demon dies, it explodes, and each creature within 30 feet of it must make a DC 13 Dexterity saving throw, taking 9 (3d6) fire damage on a failed save, or half as much damage on a successful one. The explosion ignites flammable objects in that area that aren’t being worn or carried.

Fire Aura. At the start of each of the demon's turns, each creature within 5 feet of it takes 3 (1d6) fire damage, and flammable objects in the aura that aren’t being worn or carried ignite. A creature that hits the demon with a melee attack while within 5 feet of it takes 3 (1d6) fire damage.

Magic Weapons. Thedemon's weapon attacks are magical.

Multiattack. The demon makes two attacks melee attacks or one ranged attack.

Claws. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 9 (1d8 + 5) slashing damage plus 6 (2d6) fire damage. 

Flameball. Ranged Attack: +6 to hit, range 60ft, one target. Hit: 15 (5d6) fire damage.