On Maestrea, we have our fair share of custom items. Some of those custom items are crafted. You can find the Crafter NPC at /spawn, or use /ccraft at Squire rank, to access the crafting GUI. Here are the items you will see listed in the crafting GUI:

Shady bottles are used to access tiered loot. The higher the tier, the better loot it can give.

Silky Thread is used to repair Elytras.

Arcane scrubbers are used to remove useless enchants off of items.

Infernal Scrubbers serve the same purpose as Arcane Scrubbers, but give you enchanted books of the removed enchants.