Duskpaw

Spoilers ahead! Duskpaw is an NPC that can be found in the Apprentice's Den.

After Level 1
The protagonist can talk to Duskpaw to trade any crafting item from their inventory for any other one, at a cost of 25 Gems. This does not use Daylight Hours.

After Level 10
Duskpaw no longer appears in the Apprentices' Den; if the protagonist talks to Grasspaw, it is revealed that she was killed in the BoulderClan attack.