Wars of the Black Alliance
All skeletons are magically animated undead monsters, created as guardians or warriors by powerful evil wizards and priests.
You can be sure to find Skeletons in crypts and cemeteries. But a word of advice, not all skeletons are evil animated murderers. Some are actually just a peaceful dead corpse. Don’t start beating on every skeleton you come across, because that might reasonably upset said skeleton’s living relatives.
Not the undead you’re looking for? Try zombies.