Bloodthirsty
In NetHack, a weapon is described as bloodthirsty if it attacks peaceful and hostile monsters indiscriminately when you move towards them while wielding that weapon.
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Description
Bloodthirstiness is solely associated with the artifact weapon Stormbringer, and is not formally defined with a singular flag in artilist.h - it is instead handled in combat-related code (i.e., mhitu.c and uhitm.c) that pertains specifically to Stormbringer.
While you wield a bloodthirsty weapon, attempting to move into a monster's space will attack with that weapon regardless of whether or not it is peaceful, tame or hostile. It is treated the same as if you had deliberately attacked that monster, angering peaceful monsters and abusing tame ones.
Variants
Variants of NetHack may add other artifact weapons with bloodthirsty properties.
dNetHack
In dNetHack, there are additional bloodthirsty artifact weapons, and all of them use the flag ARTI_BLOODTHIRSTY in artilist.h:
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