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Necromancers and Other Practicers of Black or Dark Magic
Necromancers are humans who have gained access to enchanted bells or pipes. They can use these bells or pipes to control the dead, but it is very dangerous, as while doing so, the necromancer walks on the edge of death. Most choose not to stray down this path, as the danger is far greater than the possible rewards.
Regular humans can summon demons, if they are willing to trade, and a demon trade is never a fair one. Often, a demon will end up corrupting the person. This drives the person mad, and will eventually kill them, but while they are alive, they are far stronger, faster, and more dangerous than any other person. Usually, a Demonmaster is charged with hunting down and removing this threat.