Anima

From Xenosaga Wiki

Both the powers of Anima and Animus were produced from the Collective Unconscious. The Collective Unconscious exists in the imaginary number domain of the lower domain. It came into existence at the same time as the birth of the lower domain's universe, i.e., the Dimensional Universe.

The power of Anima is what carries the function of the Failsafe. Due to the rejecting consciousnesses in the imaginary domain, the Collective Unconscious disperses, and the lower domain collapses, which then spreads to the upper domain. The power of Anima is the power that "safely" eliminates only the lower domain -- the Dimensional Universe -- in order to avoid the worst-case situation where the entire universe would end up being allowed to collapse. In a manner of speaking, it is the function that completely deletes the Dimensional Universe.