Katagon dagger

The Katagon dagger is a weapon obtainable only at Daemonheim. 70 Attack is required to wield it. It can be obtained through one of three ways: picked up from a table if supplied initially, dropped by a monster, and smithed using one Katagon bar with 70 smithing.

As with all items from the dungeons, you cannot take this with you once you leave the dungeon. However, if you have bound this item to yourself, leave, and return to the dungeon, it will return to you.