Darth Doom

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Darth Doom was a Sith who was Sharra's master.

Early life
Darth Doom was a Sith who trained Sharra Shan after his student died in a cave trying to look for a relic. (See Sharra Shan for more.)

Death
Sharra took this opportunity to make him old, and kill him with a saber to his back.

Post-mortem
No other saber wounds, except the back and the deceased person appears to have died when he was old.

Behind the scenes
His name is like Darth Fury. It's just basically Evil.

Basically like Doctor Doom from Marvel, in name, also because he wore a mask.