In that case, here's a concept
A Lich, with a small college of aspirants and hopefuls, wishes to create a permeant bridge between reality and Dremora's Shade. He believes that the conditions of such a creation could be ordered that it would be a controllable event, one which would allow such an outpouring of power that he would never want again...or fear the living again, for that matter.

I'm thinking a flying Wizard's Tower, too. Unsure, really.

Would such be workable?