Somewhere in the dungeon sits a room that oracles and sages know about and speak of carefully. It stands between the party and whatever they came here to find, and the legends are consistent on one point: people who cross it the wrong way don’t come back. The room is lit by a narrow shaft in the ceiling that casts a shifting pattern of light and shadow across the floor, and the shadows are the problem. The magic that built the room punishes those who don’t follow the correct pattern by taking their lives.
The legends also agree that there is a way across. The light shifts predictably, and at a specific hour on a specific day of the year, the pattern opens a path through. Step only in the light, time it correctly, and the room is crossable. Step in the shadow, or arrive on the wrong day (which would make the shadows appear in a slightly different and incorrect location), and the outcome is deadly. The research required to pin down the exact hour and date is the real adventure. Sages, star charts, crumbling temple records, a hermit who crossed it once decades ago and has been trying to forget it ever since, all of these are fair game.
Once the party has the knowledge and arrives at the right moment, the crossing itself is tense but manageable. The puzzle rewards preparation and punishes shortcuts or impatience. A party that did the work will be able to step across in the right order at the right time and walk out with what they came for. A party that guesses, or arrives a day late, or rushes the crossing because someone is impatient, gets a very different result.
Party Level: Any. The challenge here is intellectual, not combat-based. The difficulty scales with how hard the DM makes the research phase, and with the consequences for incorrect steps.
World: Any
Rules-set: Any
Note: I designed this trap/trick-based room back in the late 80s and have only used it once; it ended in a TPK, mostly because my friends were impulsive players who didn’t pay attention to the oracle’s warning. – SW
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