i am thinking a reversed sword of Damocles a chamber with rough red stone walls like a cave in the center fix a sword to the floor pointing up and tie afore mentioned enemies to an unstable ceiling by their ankles/hands depending on your preferences the floor around the sword is sand covered cardboard over a pit filled with something deadly maybe spikes or ill tempered mutated sea bass or something
the windows and doors into the chamber are all rigged with laser tripped claymore mines
i envision the ceiling giving way and the heroine getting stabbed to death by the sword if as heroines tend to do she escapes the sword by swing or something she will land in the pit with suitable deathly consequences if she somehow escapes that the claymores will take her out as she opens the now obviously not so boobytrapped doors/windows
the windows and doors into the chamber are all rigged with laser tripped claymore mines
i envision the ceiling giving way and the heroine getting stabbed to death by the sword if as heroines tend to do she escapes the sword by swing or something she will land in the pit with suitable deathly consequences if she somehow escapes that the claymores will take her out as she opens the now obviously not so boobytrapped doors/windows