"For the Emperor...." you whisper.
However, as the battle lapses for a brief moment, you realize your Curse amplified your silent prayer into a booming voice. The loyalists, emboldened by this unprecedented but sorely needed event, fight back against the traitors even harder. The traitor guardsmen seem to be losing morale.
Feeling a little pride in your beneficial accident, you stride off to join your comrades in what would be the last battle of your life. However, you stop dead in your tracks as your mind is ravaged by an external force. You are wracked with pain as the being known as Wen Blackworship tears through your untrained psyche.
To anyone else, on either side, it would have looked as if you had been shot and simply fell dead. But a psyker would have noted the intense inner battle occurring inside your mind. Not that there were any sanctioned psykers still alive, that is.
As you lay on the floor, you lose the last footholds of control in your mind, and your eyes betray you and close into a deep sleep.
The blinding ray of light makes you instantly regret opening your eyes. Slowly, your swimming vision slows and stops, and the voices of an impatient chirurgeon and a placating noble pass your ears clearly.
"Wake up, witch." The gruff, weather-beaten woman in glasses is scribbling notes on her dataslate. "Many joined the Emperor today, but there's a whole damn lot of you bastards that didn't die."
"No need for that, Amelia," says the crystalline voice. "Our friend needs some rest."
"Hmph." You see the Sororitas stomp away, harshly tending more wounded guardsmen.
"You literally saved the day, soldier. Emperor bless you." You can see his face clearly now. Lord Lunos. "My assistant tells me you are a psyker. An unsanctioned one. Duty tells me to hand you over to the Black Ships, or execute you for lying and heresy." His hand falls on the hilt of his ornate gun.
You knew this was coming. "But! Honor tells me to pardon that. You saved the lives of over a thousand men. They attribute it to a saint, a patron spirit or even the Emperor Himself, but my assistant knew better. A wonder how you shielded your psychic abilities from scrying eyes... not many can do that.
"But I digress. I have special need of you." He sees the unmasked apprehension on your face. He smiles disarmingly. "Your duty is not yet done. The Emperor spared you today, and He gave you unto me to utilize. Tell me your name."