|Damage vs. small||2d4|
|Damage vs. large||1d6+1|
|Base price||300 zm|
A runesword is a special weapon that is not normally generated. It exists to serve as the base item for Stormbringer, though it is also possible to wish for an ordinary one or find it in a bones file if Stormbringer has already been generated in your game.
When unidentified, a runesword appears as a runed broadsword, an appearance it shares with the elven broadsword. (It differs by being lighter and more expensive, dealing less damage to small monsters, and being made of iron instead of wood.)
Since the runesword is the base item for Stormbringer, it can be assumed that it has the same appearance: a sword with runes engraved deep in its black blade.
Mundane runeswords just happen to lack the sentience and bloodthirstiness of Stormbringer.