Darth Krayt's tomb

Darth Krayt's tomb was one of the many tombs in the Valley of the Dark Lords on Korriban. It was the tomb of Darth Krayt, a sith lord who eventually redeemed himself back to the light side and became one with the force. After his death, his tomb was constructed like Revan, and Anakin Skywalker. However, when his tomb was constructed, the spirit of A'Sharad Hett sealed the tomb, so no sith or any dark side user can enter the tomb to resurrect him.

History
On 150 ABY, Kyle Skywalker entered the tomb of Darth Krayt to search for some answers. The spirit of A'Sharad Hett guided him to learn the secrets about her became a dark lord of the sith.