6. Poison Gas Trap

This hallway ends in a dirty trick. When anyone steps into the last square of the hallway, the hidden portcullis (detect as secret 70 door if looked for) falls, trapping those behind it. After 1d4 rounds a bitter odor will be detected... poison gas. Each character trapped by the portcullis, as well as any standing right next to it (trying to open it, for instance) must make a save vs. Poison each round for three rounds. Any who fail fall into a death-like sleep (likely to be mistaken for death if the victim is not examined closely). The portcullis can be opened by inserting a special crank-handle into a hole in the wall near the secret door, and cranking it up. Zelinth carries the handle stuck into his belt when he comes here, while the rest of the time it will be in his chest in room 21. It can also be opened by lifting it, if the characters trying to do so have a total Strength of 30 or more, i.e. two characters with 15 or better, or one with 18 Strength and one with 12, or any other equivalent combination. No more than four characters can try at a time. This should actually be pretty easy, if they think to have more than one character try; but of course