From RoK Wiki

NOTE: The cost is the cost in gold to buy the actual crafting skill. The Ingredients are what you need to have in your inventory to actually craft the item.

Sewers

Name	Cost	Items Required
Dark Cudgel	10	Kobold Bone, Kobold's Cloth, Kobold Glue
Dark Dagger	10	Dark Cutlass, Kobold's Cloth, Smith's Hammer
Tapered Dark Cutlass	10	Dark Cutlass, Whetstone
Dark Stave	10	Kobold Bone, Dark Cutlass, Smith's Hammer
Lizard-Skin Satchel	10	Lizard's Skin, Rope, Troll Hair, Needle