Bio and explanation

For the longest of times, you had been loyal to your king. Before she was given the sword, you were the closest of friends and did everything together. Then she became king, and you her trusty knight. It's been so long sense you saw her and the others. But once we collect enough souls, we can bring them back! We can bring them ALL back. And finally, finally we will be forgiven.

(I just started playing the FGO game, so this'll be based on that. Might watch the anime for more info. Lord help me.)