Bestow curse is a level 3 Cleric spell (level 4 for sorcerers and wizards, meaning probably don't bother) that places a permanent curse on any touched creature that fails a Will save. It isn't mind-affecting, it isn't a negative energy effect, and it is not subject to dispel magic. A curse can only be removed by remove curse (no joke!), break enchantment, limited wish and up. It lists three possible forms for the curse to take:
- A -6 penalty to an ability score (bringing it to a minimum of 1.)
- A -4 penalty on all attack rolls, saves, ability checks, and skill checks.
- Each turn, the target has a 50% chance to act normally; otherwise, it takes no action.
Nice as these effects are, though, perhaps the most interesting feature of bestow curse is the next line: "You may also invent your own curse, but it should be no more powerful than those described above."
Yessir, bestow curse is entirely open-ended in letting you ruin someone's day in whatever way you can come up with. Call it Level 3 Wish, so long as you're wishing to wreck a kid's birthday party. What to do with such an accommodating spell, especially one set on such a decent baseline power level? Here, I've come up with a list of suggestions for curses you can inflict upon the DM's self-insert NPC when he least expects it: