After finishing 026 Muuurielll!, you will find that she has another quest for you, but this time in Evermore. The fence around the llapaca enclosure is giving the poor things splinters, and Muriel wants to build a new fence, but she doesn’t know what kind of wood to use. Evan steps in to suggest fine-grained lumber, which you’ll need to gather five pieces of to turn in. At the point this quest is unlocked, you can only get them from upgrading the Branching and/or Spreading Lumberyards to level 2. Put one person in each to have a chance of acquiring the Fine-Grained Lumber. Once you get five, bring them to Muriel to finish.