Gaetia Key

The Gaetia Key is a device used by the Gazel Ministry as part of the resurrection of Deus in Xenogears

Purpose
The Gaetia Key is a device possessed by the Gazel Ministry and can only be used by them. It serves two main purposes. The first purpose is for the revival of Mahanon. Considered God's resting place, Mahanon is in fact the central block of the crashed ship Eldridge and within lays the central nucleus of Deus and Razael's Tree. The second purpose is to transform humanity into their true forms, Wels, so they can be absorbed as parts for Deus.

Believing the time to resurrect Deus has come, the Gazel Ministry tries to use the key, but are stopped by Emperor Cain. Cain has grown regretful of his actions and no longer wants humanity to be turned into parts for Deus. As such, the Ministry is forced to conspire with Miang and Krelian to have Cain assassinated. After Ramsus kills Cain, the Ministry are free to use the Gaetia Key and do so. This causes the appearance of Mahanon and the transformation of most of humanity into Wels. Now that the key has been used, Krelian no longer has any use for the Gazel Ministry and deletes their memory banks shortly afterwards.

Lore

 * The Gaetia Key's name comes from two of the books of the Lesser Key of Solomon, a series of books on demonology. ("the Ars Goetia" and "Ars Theurgia-Goetia"). A symbol resembling a magic circle from these books appears on the floor after the Gaetia Key is used.