"There's an imprisoned entity, essentially a god. If it gets out, it destroys my world. It probably can't get to this one without a gate. It has to be re-imprisoned every thousand years. I did it last time, and a fairy being able to do it is likely but untested. I have some backup plans for if I'm not able to be there three hundred years from now, but those are less likely to succeed and I was rather depending on being around myself."

He's been visibly older ever since being told to "stop." He now looks the part of a healthy centuries-old human, which means he can barely stand let alone save the world centuries from now.