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Marbas
Barbas

A great lion, then a man's shape.
Answers truly of hidden things, causes and cures diseases, gives wisdom in mechanical arts and changes men into other shapes.
His twin power over disease — to inflict and to heal — is typical of grimoire “physician” spirits: the power is understood as double-edged.
The wiki traces him to the Cherubim, describing him quite literally as the lion aspect torn from a Cherub that took on sentience and motion of its own. The name Barbas is linked to the Latin barba ("beard") and to hellebore, a plant used in witchcraft to invoke demons.
The Chronicle

Marbas, also known as Barbas, is a demon that is described as the Great President of Hell governing thirty-six legions of demons.
Overview
He was likely of the Cherubim order of angels in Heaven and later revealed to have been a torn piece of the lion aspect of a Cherubim that took sentience, independent motion, and thought of its own.
He answers truly on hidden or secret things, causes and heals diseases, teaches mechanical arts, and changes men into other shapes.
Description
He is depicted as a great lion that, under the conjurer's request, changes shape into a man.
The name Barbas also comes from the Latin "barba", beard, hellebore (a plant used in witchcraft, especially to invoke demons), and also a male name.
Marbas causes and cures disease with the same hand. The offering decides which way it turns.
Make an offering · MarbasIn the message with your offering, name the spirit and state your petition — the keeper will enter them in the ledger.