Demonic Flare. When the Demonologist reduces a creature to 0 hit points with a wizard spell, a ring of magical, demonic fire explodes from it in a 10-foot radius. Each creature in the flare must make a DC 14 Dexterity saving throw, taking Cold or Fire damage (demonologist's choice) damage equal to 5 + the level of the spell on a failed save, or half as much on a success. In addition, the demonologist regains hit points equal to that amount.

Spellcasting. The demonologist is a 10th-level spellcaster. Its spellcasting ability is Intelligence (spell save DC 14, +6 to hit with spell attacks). The demonologist has the following wizard spells prepared:

Cantrips (at will): fire bolt, mage hand, poison spray, prestidigitation

1st level (4 slots): burning hands, detect magic, mage armor, shield

2nd level (3 slots): flaming sphere, suggestion

3rd level (3 slots): counterspell, fireball, magic circle

4th level (3 slots): banishment, fire shield, greater invisibility

5th level (2 slots): wall of force

Dagger. Melee or Ranged Weapon Attack: +6 to hit, reach 5 ft. or range 20/60 ft., one target. Hit: 5 (1d4 + 3) piercing damage.