Iifa Tree (Final Fantasy IX)

The Iifa Tree (it reads "iifa tree" and not "Lifa tree" as many assume) was planted long ago by Garland as a gigantic soul filter, filtering the souls of Gaia. The souls are drawn towards the tree and intercepted by the Soul Cage, a boss-monster the player must defeat in order to move on. The mist that covers the Mist Continent is a by-product of this filtering system, and the mist is pumped from the tree and to the Mist Continent through the roots.

The dwarves of Conde Petie refer to the Iifa Tree as the "Sanctuary", because after going through a ceremony, not unlike being married, the happy couple must journey to the Iifa Tree to inscribe their names.