The Sith Holocron is a furniture piece that can only be obtained by completing the Sinister Holocron collection by defeating Dark Acolytes or by picking up blue holoprojectors in the Umbaran Combat Zone. It appears as a red pyramidial holocron floating above a pedestal while giving off black smoke, and, like most collection rewards, it can only be recieved once. After one completion, all other completions of the collection had granted 
1000, but changed to 250 when the Sith Academy was released.
Collection Artifacts[]
Jagged Holocron Shard
Coarse Holocron Shard
Foreboding Holocron Shard
Seared Holocron Shard
Sharp Holocron Shard
Rough Holocron Shard
Serrated Holocron Shard
Blasted Holocron Shard