Yeah, pretty silly though. Perdan-Vix alliance was like Nivemus-Eponllyn or Alara-Minas Nova. Noone would even think about it being anything other than unbreakable. But Perdan turned into zombie realm after Kellan left and zombie realms are unpredictable af. Everyone can just flip the chessboard.
Sad thing that it has to end due to players being bored/inactive rather than due to natural events and flow of the conflict.