The Sith Dowutin's mummified corpse was discovered inside a tomb on Moraband, which also contained the Sword of Khashyun.
Ethan Sacks, the author of Galaxy's Edge 4, hinted via his Twitter account that the mummified Dowutin is, in fact, Khashyun, the originator of the Sword of Khashyun; however, this has not been confirmed through official channels.