You shout to the Infernomancer. "Yeah, you know what? To hell with fighting. I just realized it'd be way cooler to be able to summon zombies and shit anyway. I mean, it'd beat the hell out of helping chumps find their spare change. I'm throwing my hat in with you."
The Infernomancer seems pleased. "So, a powerful seer such as yourself wishes to join the forces of evil? Excellent. I have many plans for you."
And so the world gets thrust into chaos and darkness with you by the Infernomancer's side. At first, you feel slightly guilty about murdering and enslaving everyone you have ever known or loved, but that feeling soon wanes as you become ruler of the entire known universe... for about five seconds, before the Infernomancer murders you in a brilliant double-cross.
Guess you should've SEEN that one coming, eh???
YOU HAVE DIED