Watercurrent Wall (4e Trap)
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This trap consist of multiple holes in a wall. When triggered, a strong current of water will burst out of it. A dungeoneering check (DC 20) is required to realize that there's water behind the holes. This trap can be used to prevent players from reaching some areas easily, or to push them into a more dangerous trap. This trap delays until there's at least one enemy within range, after that, it attacks each turn on its initiative.
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