Thunder Lord

The Thunder Lord was a spectral energy creature that held the Feudal World of Sovereign, in its murderous grip. There it was worshiped as a false messiah by an army of savage warriors and had grown strong on the life-forces of thousands of sacrifices. A Deathwatch Kill-Team was dispatched from Watch Fortress Erioch to the planet, where they took the Thunder Lord and its army to battle. Only a single survivor from the Kill-Team returned to Erioch, with the Thunder Lord's shattered crystal heart.^[1]

Source

• 1: Deathwatch Timeline, pg. 5