A Knife is used in Daemonheim. It can be bought from the Smuggler for 50 coins and can be received as a drop from monsters. It is used in Fletching to make traps, staves, bows and arrow shafts. It is also used to open doors by pruning vines. Though the knife has no use in Dungeoneering on a free server (other than alching or selling to the Smuggler for 15 coins), it can be purchased from the Smuggler or received as a drop.