Cutting down to size
As the PCs explore a kobold warren, they encounter a long, thin hallway barely wide enough for a dwarf to fit through. Dark seams run along both walls a few feet off the ground, roughly at waste height.
When the PCs are about halfway through the hallway, a kobold on the far end activates the trap. Buzzsaws begin emerging from the seams long the wall, cutting at the characters. At the same time, more kobolds spring from hiding at both ends of the hallway and charge them. The blades are set just high enough so that they go over the heads of the kobolds.
Aren’t buzzsaws a few Tech Levels too high for a fantasy setting?
Wooden buzzsaws?
No more so than a lot of other common trap features. If you’d prefer you could change it to blades which repeatedly swing out from the wall instead.
So evil! Fall prone at be at a disadvantage to the kobolds, or stand and be chopped by the blades?
I can’t wait to spring this one on my players. >-)