I Taunt the Pant Devil Avatar GuideHope I helped you :3
(you need an account to see links)
First You will need a minimun of 50000~80000 NPs Depending on the price
Now you can Buy Obsidian Dagger (You'll need 81)
After Buy this all, visit your inventory... And... (you need an account to see links)
It's small and this is my first Guide :p