Crux Prime is the world on which Nexus Tower is situated. It is still a scene of heavy fighting between the Maelstrom and the Nexus Force. It is a jagged landscape patrolled by the most powerful Maelstrom monsters, which are known as Stromling Invaders, or just Invaders. This world was released on February 8th, 2011. Being the largest world it offers up the most amount of U-Score, enough to get from Level 30 to Level 40.