Orcrist

The Orcrist is a chaotically aligned elven broadsword. It is one of two artifacts in the game that can be created by #name-ing them. To do so type in #name, select a normal elven broadsword, and name it Orcrist. To make sure you did it correctly, you may now try to name the sword into something completely different – all artifacts resist naming. The Orcrist gives a +d5 to hit and double damage against all orcs.

In previous versions

In Hack 1.0 and Hack 1.0.1, any weapon can be named Orcrist and do extra damage against orcs; there can even be more than one Orcrist.

Hack 1.0.2 restricted this advantage to two handed swords. Other weapons could still be named Orcrist, but would do no extra damage.

Orcrist became an elven broadsword in NetHack 3.1.0.