Monster in the Darkness

Monster in the Darkness was a familiar of Emalf, with Emalf describing them as his "ultimate familiar." They appeared in The Gray Garden.

Physical Description
The Monster's physical appearance was never shown in game. However, they were presumed to be quite large, and had red scleras and yellow irises.

Background
The Monster in the Darkness served as Emalf's "ultimate familiar" for their apparently enormous strength prior to their death by the hands of Ater and Arbus.

Minor

 * The Gray Garden - In the Sea of Tears, Emalf was about to summon it to battle Yosafire and her friends. Before he did summon it, however, Ater and Arbus had come across the Monster and slaughtered it. When Emalf summoned the Monster, it had been rended into large chunks of flesh. With no other ideas, Emalf fled the scene. It's remains were later eaten by Rawberry.

Emalf
Emalf was the familiar's master. Not much of their relationship is known. They were kept in a cage by Emalf and were able to be teleported by their master whenever and wherever Emalf needed them. Emalf once boasted how they were his "ultimate familiar."

Trivia

 * Monster in the Darkness is the only known familiar with an unknown physical appearance.