Can find and fix the underlying source of flaws in both humans and material objects. If you command him to cure a sick person with a disease, the afflicted person has reported dreaming about a friendly lion and waking up feeling much better. Besides from healing humans, Marbas is also very knowledgeable with finding and correcting any imperfections in architectural or mechanical engineering.
Appears as a large friendly lion, however has the ability to transform to a man with the head of a lion at your command. Although his appearance is strange, there is nothing to be frightened of.