Centrum & Homeline are part of the Ying-Yang Nexus. These two realities are two faces of the same coin. Opposing forces that are at an eternal war in the multiverse and don’t care who they use to defeat their enemy. Homeline is a world based on Athenian practices and Centrum is a world of war and pollution. Their technology allow for interdimensional travel and they have equipped their slide-ships to send operatives to different realities. PL:7. SOURCES: GURPS: Alternate Earths (RPG), Multiverse (Comic), The Timeline Wars (Novels). d20 Future: Dimension X.