Eibon

You are trying to summon a being by use of a sigil and ancient magical rites from an old magical tome you found at an estate sale. You begin a conjuration and a dark figure in a robe with a black staff with a glowing red crystal appear. It looks humanoid but marsupial, almost like a lemur. zit has short fur over its body. There are glowing runes upon the floor surrounding the being. It speaks claiming it is Eibon, the Great Archmage of Mu Thalon, and an Isidim. I can teach you magic, it says.