The wise among the Conservative Faction could see that the Three Sources of Evil weren't easy to control. The Abyssal Demon Gods and the Star Sea Gods could easily lose control of the situation.
When the Three Sources of Evil fully erupted, the Star Sea and the Abyss would enter a new era. That would be their chance.
Some Necromancers and Liches in the Reformist Faction understood this as well.
They didn't directly pledge themselves to the Abyssal Demon Gods and the Star Sea Gods because they wanted to exploit this opportunity.
They would use the power of the Three Sources of Evil to rise, then make themselves independent.
They weren't going to remain under someone else's thumb forever. Pledging themselves to the Three Sources of Evil was just a way to borrow their banner for protection while they grew stronger.
When the Three Sources of Evil erupted, they would have a head start over the Conservative Faction and could seize the initiative with their formidable strength.
Tzeentch, the God of Conspiracy, spent all day complaining about how weak they were, urging the Abyssal Demon Gods and Star Sea Gods to loosen their restrictions and let them ascend so they could better oppose the Light Alliance.
The Abyssal Demon Gods and Star Sea Gods were unwilling to unleash the Three Sources of Evil. Instead, they wanted to tighten their controls, giving the Reformist Necromancers their opportunity.
They had arrived at just the right moment. The Abyssal Demon Gods and Star Sea Gods put them on leashes, let them ascend to godhood in the Tzeentch, Khorne, and Nurgle Planes, then assigned them to attack the Light Alliance's territory alongside the Star Sea Evil Spirits and Abyssal Fiends.
The Reformists had pledged themselves to the Three Sources of Evil, only to become