Thunderwave/thaumaturgy

Make a DC 15 Charisma [or spellcasting ability] (Intimidation) check (whichever is higher).

If you succeed, click the spoiler box below:

Success

You hear a combination of startled yelps and cries, coming from behind the stalagmites and the pile of supplies.

Close this tab and go to the second grey spoiler box under Area 8 in the Play It Solo article. Pick option 1 and resolve the encounter as described there.

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Close this tab when done.