Not much is known about the origins of the Staff of Polar Power. It is only known that it came to be owned by Nebulos of the Planets Perilous. It is possible that Nebulos created the Staff, but even that is unconfirmed.
Functions of the Staff of Polar Power
The Staff of Polar Power is used to absorb evil magical energy. It can absorb a virtually unlimited amount of evil energy from any and all sources of dark magic. The Staff of Polar Power grants the wielder a vast assortment of magical abilities due to the evil energy contained within it, and it will make its user even more powerful as more evil energy is absorbed. The evil energy contained within the Staff became so potent at one point that its power was enough to sear the bodies of both Nebulos and the Living Tribunal itself as they struggled for control of it.
Wielders of the Staff
Aside from Nebulos, the Staff has been wielded by Doctor Strange in order to defeat Baron Mordo in battle.