Sith warblade

A double-edged,single-handed,serrated sword weaved with a cortosis sheathing. A classic and traditional Sith weapon used in dueling or melee combat.

It was primarily used by the Sith before the vibroblade was produced, which later replaced the Sith Warblade as a more suitable weapon.

It's ability to resist lightsabers(having cortosis properties)was what made it a favourite of the Sith military.

Appearances
Star Wars Knights of the Old Republic