If it was not apparent from my performance with Tarith, acting is not one of my strong suits, if we can draw them into the tunnel then we can try trapping them inside the vault, how do we remove the keys and seal the vault anyway?

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that's a shame, Knowledge Architecture and engineering (buildings, aqueducts, bridges, fortifications) would probably be the most useful for trying to figure out the lock, but I wont have it till next lvl.