Abyssal Tyrant Fiendfused

Fiendfused are the rare result of fiendish possession gone wrong. When the soul of a possessed mortal is destroyed or destructively removed the possessing fiend sometimes takes its place. As an outsider’s soul is the same as its body this causes the body of the mortal to take on aspects of the fused fiend.
In rarer cases a black-hearted and willful mortal can take control of the power of a possessing fiend, fusing that power into their body, or when a ressurrection in a deeply corrupted place drags a fiend in along with the mortal soul.

No matter how a fiendfused is created it is a messy and imperfect process. Usually most of both participant’s memories and personality are damaged or destroyed, with the remains fusing into a new being.

Abyssal tyrants are the result of the fusing of a mortal humanoid and a balor demon. As balor are the most powerful of the common demons they only rarely stoop to possessing mortals, only taking those mortals of great power and evil. This makes the differences between the two parties of the fusing, reducing the difficulty of the process significantly.

The few abyssal tyrants who exist are among the most dangerous and evil beings on the material planes. They almost universally rule large empires with heavy hand and brutal fear. They use their armies to spread violence and destruction, creating a reflection of the abyss upon the material plane.

CR 18
CE Medium Monstrous Humanoid
Combat Role: Brute

The abyssal tyrant has powerful melee attacks. Their ensnaring blades ensnare the victims in nets of force, forcing them to remain in reach of the tyrant’s attacks. The tyrant’s attacks are additionally filled with unholy damage, on top of that when a tyrant is struck by a critical attack a gout of hellfire lashes out at the assailant.


Agrador Flamefist was the dwarven ruler of one of the most feared and ruthless empires of history. He ruled for centuries with utter terror and ruthlessness. The greatest weapons of the empire were great rolling siege engines each powered by a captive balor demon. Many of these siege engines were build and still remain, as Agrador seemed to have known the true name of many balors. 

A new villain has been  striking out against the PCs. They have never seen the fiendish enemy before, but he looks strangely similar to a dead friend, and he seems to know things about them only their friends should know.

As the PCs act against a powerful tyrant they come across evidence that their enemy is preparing a mighty ritual. What is the purpose of the ritual, and can they stop it in time?

Malevolent Medium Monsters, 16