| The passageway straightens into a square-walled cavern some forty feet long and twenty feet wide. The floor is covered in iron, and the rocky ceiling stands ten feet high. Beyond the iron floor, the passageway turns back to rough stone and turns to the north. |
With a successful DC 12 Intelligence (Investigation) check, a character notices that the iron floor is set with a groove at its center, bisecting it lengthwise. If more than 50 pounds of weight is placed on the iron floor, it splits open and its two halves swing down, revealing a 10-foot-deep pool of water 5 feet below where three hungry
Reef Sharks are waiting. The floor resets automatically, snapping shut after being open for 1 minute.
Each creature standing on the iron floor when it opens must succeed on a DC 13 Dexterity saving throw to grab onto the wall and avoid tumbling into the water below. A creature can try to avoid falling into the shark-infested pool by staying close to the wall; it must succeed on a DC 10 Strength (Athletics) check for every 10 feet it moves or tumble into the pool.
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