At the very bottom of the mysterious ruins of Pso'Xja is The Shrouded Maw. This dank chamber is filled with a aura of darkness and it is said that the the glyph atop the pedestal is in fact a gateway to another dimension...
In the battlefield events against Diabolos, it is possible to flee the battlefield by falling through the floor, putting the Diremites to sleep, and then running out of the lower arena and to the Memento Circle on a pedestal ahead.