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Grulgor was the commander of the second company of the Death Guard legion. He was born on Barbarus and like many of his legion from that planet, despised some of the old traditions that his brothers from Terra practiced. He was very headstong, and always looked for a chance to impress Mortarion. At the begining of the Hersey he sided with the Traitors, and was stationed on the Eisenstein with Captain Garro and his loyal marines, who he was supposed to eliminate. He failed, and was killed by a virus that escaped from a damaged virus bomb. However, after the Gellar Field on the Eisenstein began to fail, Grulgor and his fellow traitors were gifted by Nurgle with new life. They proceded to attack the loyal Death Guard once again. Grulgor managed to infect one of Garror's men with Nurgle's rot, and almost triumphed over Garro. However, Garro ordered a emergency drop out of the warp. With out it's infernal power sustaining them, Grulgor and his corrupted brethern were killed, their souls sucked back into the warp.

However, this was not the end of Ignatius Grulgor. He was seen leading a company of the Death Guard during the battle of Medusa V.