Blood of Sanguinius

Blood Angels Brother Kravin, grievously injured in battle with a monstrous enemy, fights to return to his battle-brothers before his body fails. Pushing his transhuman form to its very limits, Kravin knows that he must return what he carries to the Chapter – he cannot die until he delivers his legacy.

Read it because
Even the mighty Angels of the emperor can fall. In this short story, we witness the dogged tenacity of the Blood Angels.