Diabolus Arcem

Once called Atlantica, this beautfiul ocean world was invaded and corrupted by Primoris Carmina. He enslaved the mer-people, and seized control of of their king's Trident, using its power to control the world's oceans and use it against any and all intruders. Eric's castle was turned into his and Master Xehanort's fortress,a massive tower of twisted black metal, guarded by armies of the most powerful and deadly of heartless.

Primoris called their new lair Diabolus Arcem, a latin phrase meaning the "Devil's Citadel".