Heart of Graush

Through the use of Sith alchemy, the Sith Dark Lord Dathka Graush replaced his own heart with a Force-strong crystal later called the Heart of Graush.

The original creator of the Heart is unknown, but it was known that Heart contained dark side spirits gathered over thousands of years. Graush used the Heart to make himself almost invincible.

Thousands of years after the Dark Lord's death, in 0 BBY, the Captain of the pirate vessel Jynni's Virtue, Naz Felyood, discovered the Heart buried in the Valley of Golg. Unfortuantely for the Captain, this led to his possession at the hands of Graush.

In the end, his comrades destroyed Jynni's Virtue, and Felyood lost the Heart in the process. He wondered Korriban for a long time afterwards, ageless, constantly searching for the Heart.