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 Yoma demon Agathion, and contains information on all of its skills, stats, fusion combos and more.
A familiar with no physical body that only appears during the day. There is no consensus on the appearance of an Agathion: it can resemble a human, bird, or animal. They are usually seal away in bottles or pots, but can also be sealed in rings or talismans. The term Agathion is also used as a general term for familiars.