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)   Thiefbane   Long sword.png
Base item long sword
Damage vs. small 1d8 +1 + level drain + cancellation + beheading
Damage vs. large 1d12 +1 + level drain + cancellation + beheading
To-hit bonus +5
Bonus versus @
Weapon skill long sword
Size one-handed


When carried


When wielded


When invoked


Base price 1500 zm
Weight 40
Material iron

Thiefbane is always generated in the inventory of One-Eyed Sam (unless wished for before Sam is generated). Thiefbane is typically generated with an enchantment, but the greater prize is the instadeath by decapitation (10% chance) on monsters symbolized by @. Thiefbane also has a 1 in 6 chance of canceling whatever it hits, which is probably you.[1]

Note that Thiefbane may blast you, even if you are chaotic.

Acquiring Thiefbane

Given that One-eyed Sam is level 24 and carries most of an ascension kit, it's usually a bad idea to simply engage her in melee. A scroll of earth or scroll of flood may fix One-eyed Sam on her spot (assuming she is not flying), and highly enchanted firearms or poisoned darts work fine for the kill. More suggestions can be found at the black market page.

However, this is not neccessary to acquire Thiefbane. If you are appropriately fast, armored, brave, or stupid, and you have the disarm technique and can hit with something you are at least skilled in, you can steal Thiefbane. Be aware that you still risk decapitation. If you try that, you will need an escape plan that works despite the black market's restrictions. One way is to apply (break) a wand of digging, trapping her (away from the door). Note that unless you are wearing an amulet of life saving, you don't really need an escape plan, since you won't be around to use it.


In UnNetHack, Thiefbane's base item class has been changed to two-handed sword and the player is in danger of being decapitated even if not in a form symbolized by @.

As if that's not hard enough, UnNethack does not allow Thiefbane to be wished for (the code calls this wishing abuse).[2] So you're going to have to fight her and her sword.