Manin was originally forged for an unknown Rider long before the Fall. It, along with a large number of other swords fell into Galbatorix's possession and was rediscovered by Gedric after the Rider War. Gedric selected it from the rediscovered swords, although his attempts to trace its provenance have so far failed.
The pommel is set with a black diamond from the Beor Mountains, containing some residual energy from the previous owner.
The sword is black, with a silver hilt. The edges give off a pale glow.