Non-lethal "keep away" traps
Hello everyone :)
I'm looking for ideas for traps, that a group of Kobolds living below a house in a big city could have set up to chase people out of their lair.
The kobolds in question have been chilling there for a while now. They've put up traps in the house to alarm them if anyone enters and in their cave to chase would-be intruders away, but they don't really want to hurt anybody. They just don't want to be kicked out (since the cave is technically on someone's property), and I would like to have some traps where the PCs can notice after a while that nothing tried to actually kill them.
One thing I have in mind is a pit trap, deep enough to maybe hurt a bit, but not be dangerous, and in the house, they had metal buckets full of water on the doors and put up pyramids of empty metal cans in a way that someone who's not careful while opening the doors (due to expecting traps) would kick them over, making a lot of noise alarming them to hide.
The leader of the kobolds is a little magically gifted and prepared the rooms with the Magic Mouth spell, which he uses to threaten intruders and make them believe there is a powerful being in this cave