Soulcage

The SoulCage is the source of the Mist which plagues Gaia.

Soulcage oversees the physical manifestation of the Iifa Tree and its functions, utilizing the by-product of mist to incense the will to fight in civilization. An undead being who has existed for nearly a thousand years, his visage is a cruel mockery of a tree. Strangely, he "cannot lie," leading to some revelations in the plot. Being "undead", he is easily defeated with a "Life" spell, a Phoenix Down or an Elixir.