No, necromancy is not a normal part of the DungeonVerse, it is actively bad and vigorously opposed by all powers that be, and for a good reason

A tree bearing sickening fruit, a thing of horror turning its victims into undead servants.

An explosion rocked the city walls as if a hundred mages unleashed their fury upon the peaceful people of Souls'e Province. An instant silence in the wake of the blast was nearly as loud as the noise that erupted right after as another series of explosions followed the first. Then the screaming began. Low at first, then became physical as if a wave of noise punched us all in the gut and sent us to our knees. Even the guards began running, screaming. 'The people, they... they are murdering everyone. The city has gone mad. RUN!!!'

The dark side of the ubiquitous skeletron, corrupted from within by it's own basic technology.

Guilt is a powerful force

You think the zombies are bad? Wait till you meet their masters!

The unnatural offspring of a zombie father and a human mother.

All Maire wanted was to give her husband a child. She wasn't about to let death stand in the way.

Nuclear war, zombie outbreaks, meteor strikes, economic collapse, alien invasion, no matter how it happens an apocalypse makes for a unique and engaging setting to run a campaign in, even for a jaded GM.

Here's a few quick tips that can make a good zombie or other post apocalypse game a great one, and keep the group coming back (from the dead?) for more.

A few quick and techniques any GM can use to make a zombie apocalypse campaign a success without becoming to stressful or repetitive for to run over the long term:

She left me, I couldn't deal with it. I sat there with the barrel of the gun in my mouth for a long time before I pulled the trigger.

(Graphic Warning: Not for delicate eyes)

The Zombie Strain, as the infection was most commonly known, was actually identified as PrP-1174, a prion.

The Harakan have been created with only one purpose in mind. They hunt the despised slaves of the Empire

It may be wondered why packs of wolves, Giant Spiders and other such animals would attack PCs, when said PCs are normally armed to the teeth with deadly weapons and spells. Surely it would make more sense to attack weaker prey? Sometimes it is because the PCs are threatening the animal's territory or cubs or egg sac. Sometimes the animals may be crazed with hunger. Or it may be because the animals have become infected by Atissi worms.

An order stretching back to the first days of the Plague, the Knights Medicus are starting to die out as the Plague deteriorates their numbers.

The spirit which dies with a murderous rage upon it’s conscience cannot rest, and re-inhabits the corpse it once dwelt in, stalking the earth in search of one thing: revenge.