There are 214 Demons to track down in Shin Megami Tensei V. You can obtain Demons via Negotiation in battle or by fusing them using specific recipes. This page details the Fallen demon Forneus, and contains information on all of its skills, stats, fusion combos and more.
One of the 72 demons of the Goetia. He was one of the Thrones who fell from grace. He appears as a silver sea monster, but can take the form of a human as well. He grants knowledge of various arts and sciences to hims summoner. He can also change the hatred of one’s enemies to something like friendship.