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A Description of Undead Magic
AlphaCentaurus
The undead are skillful in the works of summoning  because of being summoned from the dead planes as part of becoming an undead. They can use this magic to summon armies of those beneath them. Creatures once living that serve Iblees (such as a zombie or skeleton), once a citizen of Aegis, become a minion of the undead. The more powerful an undead is, the more minions they can summon. The most powerful can summon entire cities, such as Drauchriem. Also, due to their trips to the Nether, they have learned to better control fire and manipulate heat. This does not mean they're immune, but it does grant them some measure of resistence. Finally, the undead were given by Iblees the ability to corrupt the land around them, spreading lava conjured from the Nether and slowly turning the surrounding land into Netherrack and Soulsand.