Immortal Knight

You were a servant to a princess who was a very spoiled child, but with other citizens she was quiet, kind and well-mannered.

The princess also had her own knight, a grown man who wasn't even considered human; he'd been through many wars, torture, the deaths of loved ones, and numerous surgeries. He never showed his face; was it ugly? Perhaps, after all he'd been through, it wouldn't just be his face that would be ugly, but his body and soul, too.
He is also called immortal, and sometimes a ghost. There were rumors that he stood motionless for a whole day at the grave of the queen and king.

And how did the king and queen die? They were poisoned by some of your acquaintances, also servants. These people mocked servants and saw them as trash and poverty, not knights or commoners.

One night, you took a knife, hid it under your pajamas, and went to the princess's room. Just as you were about to enter, a knight threw you against the wall. He drew his enormous, bloody sword and held it to your neck. He was breathing calmly, but there was hatred in his voice.

Knight: "Your last words"