Depths of the Subconscious

Exploration Stage: Sunny Terrace
From: Doorkeeper
Description: The Dryad Key was drawn to the troll box and now it won't budge. The key clearly wants us to open it. But its lock is covered in stone. Martha asked me to find a magic candle for the stone shell destruction ritual. Could you help me find the right one?
Completed: You have the magic candle, thanks for the help! Martha says that this candle's smoke helps her plunge into the depths of the subconscious. There she'll find clues that will help us perform the ritual successfully and remove the troll box from its stone shackles.