Marbas is a great Fomori Lord, also known as Barbas. This demon initially appears in the form of a great lion, but when compelled to take on an appearance more conducive to negotiating a pact, he will change into the form of a man. There is no specific race, gender, or description used more often than another on record. He commands 36 legions of his brethren. He will disclose, or direct his subordinates to seek out and disclose, the secrets of another or the location of that which is hidden. Be cautioned… although he is bound to answer truthfully, his servants are not. His touch and his breath can bring disease, and he is able to cure the same. This demon is often sought out to be a patron for those engaged in the mechanical and engineering professions. The technical wisdom he can impart to those in these fields is vast. He frowns upon those with little or no technical knowledge, and can be more difficult to negotiate with for those without the base prerequisite skills. He is also partial to those who earn a living with handcrafts.
Marbas also has the power to change mortal men into other shapes. Ensure that any pact asking for this benefit also contains a clause requiring him to change you back… otherwise an animal form may be the last one you inhabit before your feet touch the Low Road and you begin your journey back to the cauldron. If you are seeking the gift of lycanthropy, you would be better served with an appropriate ritual. Asking for the aid of this demon would not hurt though. Many who have set their feet upon that path carry his mark. (24)