Darth Slayer's blade

Darth Slayer constructed his blade in 12 BBY. Despite his Sith Affiliation, his blade was blue. This was because he couldn't find the proper crystal for a red blade. Amaka Utree stole this blade in 1 ABY when he used it to kill Darth Slayer. The Fate of this blade is unknown but it is expected to have been destroyed when Amaka Utree Died.