User blog comment:ArmInAss/If I Ever Govern A Monster-Friendly State/@comment-25985177-20150625121803

Concerning the first point, given the exsistence of magic... Can we not simply have some form of cyclotron/vacuum to absorb all the demonic energy, and in turn use the accumulated demonic energy to power itself? That would solve the problem, but the another would arise, someone powerful enough must cast and power the spell, until the point where it has begun to accumulate demonic energy.

I'll leave it to you guys for that.