Here's how you can do it if you want it to be as effective at preventing intrusion as possible. (This is going way beyond dick move and also likely needs higher level enemy but in case he survives to higher levels here ya go.) Teleport trap directs to demiplane. The demiplane has negative alignment (-2 hp per round) put permanent prismatic sphere on location they land at. Put walls around inside of sphere with symbols of: death, striking, sleep, stunning, slowing, distraction, weakness, and insanity. Add limited magic trait so they can't teleport away. Make outside sphere a maze that leads to gate to material plane with symbol of sealing on it. Disclaimer: this should never be used due to it being damn near impossible to survive but if get rid of symbols and negative trait then add monsters to maze it could be mini dungeon.)