The War of Agartha was a conflict fought before time between the Keepers and their brethren, of whom were corrupted by the dark Aether.
The uncorrupted Keepers won the war, banishing the corrupted Keepers into the dark Aether. These Keepers (with the Shadowman being amongst them) would, with time, evolve in to the monstrous, demonic creatures known as the Apothicons.
After the war, the Keepers became guardians of the multiverse, dedicated to protecting universes from the threat of the Apothicons.
- Doctor Monty had an unknown role in the war, presumably fighting against the corrupted Keepers.