Exdeath

Ex-Death (also called X-Death) is the final boss of Final Fantasy V. Though it appears several times as a knight, its true form is that of a tree. At the end of the game, the heroes must fight it twice. After defeating it for the first time, it transforms into its final form which is called Neo-Ex-Death. The Totema Exodus from Final Fantasy Tactics Advance is based on Ex-Death.