Glasya-Labolas is the 25th spirit of the Goetia and a great President of Hell. He appears in the form of a dog with the wings of a Griffin. He is capable of teaching men of all the arts and sciences in an instant and is an author of bloodshed and manslaughter. He can tell the summoner of all things in the past and what is to come in the future. If desired, he can cause the love of friends and enemies alike for the summoner, a well as make them invisible. Glasya-Labolas rules over 36 legions of infernal spirits and his seal must be worn upon summoning him, or he will not obey the summoner. According to the Grand Grimoire, he is a direct subordinate of Nebiros.