Talk:Tier Magic/@comment-88.203.126.251-20170428183010/@comment-36605886-20180816115516

It's a D&D-type magic system. As you move up the tiers, the power necessary increases exponentially. By the time a caster reaches sixth-tier in D&D, they're already fighting ancient dragons and liches. By ninth-tier, they can alter reality itself. Since Overlord's author played a lot of D&D, I'm assuming that similar mechanics are at work.