On a world making a last stand against Chaos Space Marines and Traitor units, the only troops that remain are a squad of Kriegers and a squad of Cadians. They were waiting for reinforcements however at the last second they were informed that help wasn't coming. It was just them, even the Commissar was already dead. However just as a Chaos Space Marine was about to slash the last remaining medic with a Chain sword, the blade was stopped. The Medic could only see a girl with un even pig tails and a white star on her trench coat. However a blue flame was over one of her eyes and it grew larger just before she counter attacked the Chaos Space Marine.
The Guardsmen never seen her before but they knew of her, Black Rock Shooter. Every one who saw her could only assume that she was of the Emperor. There was no other way to explain how someone with such power could just appear out of nowhere. Up to this point the idea that the Emperor had 'Daughters' was just rumors at best to the men here. However, this is proof that the Emperor was once again taking an active role in the day to day operations of the Imperium.
BRS quickly dispatched all the forces of Chaos that had threatened to overrun their positions. Even though the Kreigers were ready to chase the enemy down, they had to settle for using artillery as what remained of the retreating enemy was too far away. The Cadians took stock of the situation. Meanwhile the Medic BRS saved just looked up at her as BRS looked out over the now (mostly) dormant battlefield. The medic wondered what she was thinking and before he could even go to speak to her a Kreiger ran up to her with a Vox.
"Hello?" She asked over the Vox.
"Finally, I was starting to think everyone was dead down there. Am I to Assume that you are in command down there?" The voice on the other end of the Vox said.
BRS looked around and the Kreiger just nodded. "I guess."
"Good, well then, I am Patrol Fleet Admiral Nathaniel Octers, Commander of Patrol Fleet Arcana, mind telling me who you are?"
"I'm Black Rock Shooter."
"You're telling me you're one of those 'Daughters of the Emperor' the Guardsmen keep going on about?"
"I guess."
"I am having a hard time believing it, but the Imperium needs all the help it can get. But let's get to the point. I have arrived to evacuate the survivors from the planet and then perform a manual Extermanadas."
"How come?"
"My fleet does not have the reserves to hold the planet and while I command a force of light ships the size to rival a Battle Fleet, I am only capable of contesting the space around the planet. The closest Battle Fleet is currently overseeing campaigns on ten different worlds. As such you'll have to depend on me and my forces."
"I guess we have no choice then."
"Indeed you do not."