1alliance vs 1 alliance aka 1v1
During the lore there was the possibility of faction alliance that could've stirred great PvP changes. Uldah and is hard vs Limsa and gridania. Linda and gridania leaders left the scene when uldah was in trouble. Is Harvard was tricked to leave. Uldah could've taken arms against Limsa and gridania for not trying to find out what happened to the sultana aka the alliance of the 4 nations. Ishgard would've taken uldah side I'm sure that's why they were tricked to leave.