H is for Haborym

Haborym is a fire demon and revels in the destructive and lethal nature of flame. When not commanding fiendish legions, he enjoys riding a giant flying vampire in the mortal realms and setting communities aflame.  For this reason, his name is cursed by more mortals, than most of his brethren. Still, some insane occultists and pyromaniacs seek him out for his intimate knowledge of flame.

Haborym
Armor Class: 4 [15]
Hit Dice: 6
Attack: Torch (1d6)
Special: See Below
Move: 12
HDE:  11, 1,700

Haborym's giant magical serpent serves him as a mount and has a Fly speed of 18. The pair are immune to nonmagical weapons. In addition Haborym is immune to fire damage. He can cast Fireball 2/day

Summoning/Bargaining Ritual Modifiers: Commit arson in Haborym's name (+1 base and +1 for every victim killed)

Potential Boons: knowledge of the fireball spell, reduced damage or immunity to fire damage, ability to speak with felines, ability to speak with serpents

Potential Banes: occultist dazed by fire (saving throw when seeing fire of at least camp fire size or be dazed for 1d6 rounds), occultist smells of ash and burnt flesh, character's hands leave a sooty hand prints