As usual, the climbing is slower going and a greater effort for the smaller, weaker, or more heavily armored party members, but the handholds are well-made and make the ascent relatively safe, especially with assistance from above.
Within minutes, all can be assembled in the room above. The tunnel through which Artanis entered yesterday has been collapsed. Only the tunnel through which yesterday's foes fled remains.
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For those already on the upper level, there is a minute or two to spare here, if you have actions you'd like to take.