Why is most magic used for evil? Well, because...
Often PCs get on the wrong side of powerful users of magic or break into enchanted tombs, either may get them on the wrong side of a curse.
Many roleplays are set in a world where much of the land is held by barons and other nobles serving under the King or Queen. Sometimes the PCs may need to meet these nobles to ask for help in their Quest, at other times they may be caught for breaking the law and end up with their lives in his hands. Yet nobles are different;some may be good people who care for those underneath them and are loved in return, others may be unpleasent tyrantts hated and feared by their underlings, and still others a bit of both. With this in mind I present thirty nobles
Oazduke's Vengeful Head.
The head haunts all headsman and executioners.
A floating, bloody head, long separated from its body, is a particular legend among a very particular group of people, executioners, specifically those that chop heads from a block for a living. It was that infamous highway robber, Oazduke the Vengeful, who when finally captured and put to the axe, screamed his foul hex, seconds before his head flew off.
"You will know it is me when I'm through
A curse on your ilk and on you!
May my severed head haunt you eternal
Frightening you headsmen infernal!"
Years later, not one but two(!) weary, puffy-eyed, spooked, headsmen, haunted day and night by Oazduke's insufferable severed head, approach the party cleric in order to hire him to exorcise the ghost head once and for all.