Sneaky bastards, the lot of them
Some sovereigns prefer a different sort of tax from their subjects - whether freely given, or taken by force.
A dreamer is one who can only find his way by moonlight, and his punishment is that he sees the dawn before the rest of the world
Magic is the lifeforce of all living creatures, and it is from it that all life is made - in areas with lots of undead, magic might actually be missing or weak, which puts a whole new spin on how dangerous the undead are. Even simple zombies can be troublesome if you're relying on mages and you hit a pocket of undead making a low-magic zone...