You've been warned.
So in my current world, I had a wonderfully generous demon - Lashid Spurtedlust the Fated Blister - who kindly convinced the humans he was an incarnation of their God of Death. I'm not sure if it was Lashid or the deity itself, Mothi, who created the first necromancer in this world, but it was undoubtedly Lashid who penned the book that taught my adventurer to raise the dead.
I feel confident in saying that Lashid came to regret that decision.
Lashid installed himself as a Law-Giver in the local human civilization. As a result, he hung around a fort, wrote a bunch of books, and had them lying around on the towers. I was able to wander in, read what I wanted, wander out, raise an army of the dead, then come back just to see what would happen. Suffice to say that I was amused when he immediately began to fight my zombies as they filed into his throne room, or study, or whatever you'd call that windowless place full of trinkets and statues. The battle appeared pretty one-sided; sure, he could spit frozen extract at the zombies, but what good does that do when there's twelve or more of them and the toxic aspect doesn't harm them? Ultimately, I got this message:
And the zombie dwarf became known as Truthfulearly the Auburn Dead of Obscurity, having secured his fifth kill.
Let this be a lesson to you, kiddies; towering, bloated, one-eyed chameleons twisted into humanoid form with black, overlapping, oval-shaped scales and deadly spittle are no match for swarms of the undead.
As an aside, my undead army and I stormed the world's one necromancer tower a while earlier and slaughtered everything we could find there. I took the slab with me, and out of curiosity, read it. Did you know that it's possible to learn two different methods to animate the dead? Or that, if you do so, you have two separate interactions you can use, thus circumventing the normal cooldown on the ability?