They prowl dungeons the world over, lurking around corners, behind locked doors and in treasure chests. They have no conscience to appeal to, no mind to reason with. Negative levels or ability drain won't so much as slow them down, and even no-save, no-SR spells like forcecage or maze won't do a thing. They can threaten any character, from level 1 all the way up to level 20, and take many forms. What deadly creature could this possibly be...?
Traps!
Yes, the staple of dungeon hazards, traps have been dutifully stabbing, poisoning, dropping, slicing, dicing and polymorphing-into-spaghetti-ing hapless adventurers since time immemorial. Generally they are something to suspect and avoid, to shove the rogue at in hopes of tasty XP before moving on. But in truth, traps are misunderstood creatures. Their name might inspire fear and caution in seasoned adventurers, but with a bit of kindness and a lot of gold, one can bend these gentle, beautiful, inanimate creatures to their own whims. With some careful set-up and some rather gross subversion of the game designers' expectations (as usual,) traps can be a source of immense power.