It can be obtained through one of four ways: picked up from a table if supplied initially, dropped by a monster, smithed using one Katagon bar with 70 smithing, or taken out of a locked chest.
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.
Short but pointy. (Tier 8)