There were these Archons (Not sure what their name was?) that weakened the Invasion Forces and the Light. The Invasion Forces had to do something with them (Capture? Get them to a certain region?) in order for them to stop getting weakened (Or something like that). No Force managed to capture their Archon and the Monsters didn't even seem to have tried, as Power was chilling out in Rines for a long time. The Monsters were the first faction to be defeated too. I do believe the Daimons tried, as I believe they requested Enweil's help (But I bet the Daimons didn't fully trust them anyway), but Enweil will have better knowledge of how and what happened there. No clue about the Undead, they mostly stayed up North away from us.