Regarding the death of Diluc's father, the Knights of Favonius maintained that he had, after all, used a dubious power like a Delusion. It would reflect poorly on them if word got out.
Besides, there was nothing to gain from giving honor and credit to someone who was already dead.
It was better to leave the credit and glory to the living.
And so, the Knights claimed the credit and glory for defeating the Dread Dragon.
Back then, Diluc had been raised on the most orthodox ideals of chivalry.
The Knights' true colors and conduct stood in stark opposition to his upbringing and beliefs.
At the time, Diluc had believed he received his Vision because the gods had acknowledged his dream of working hard to join the Knights.
But after seeing how the Knights treated his father, a deeply disillusioned Diluc left his Vision with them and resigned from the Knights of Favonius.
After leaving the Knights of Favonius, Diluc began investigating Delusions and the Fatui.
Perhaps it was because he had abandoned the Vision that represented his ambition, or perhaps it was the long years of hardship abroad.
Whatever the reason, when Diluc returned to Mondstadt after years of wandering, his former enthusiasm and vitality were gone. He had become the Master Diluc of today: cold, expressionless, and showing little warmth toward anyone.
Later, Kaeya, who remained with the Knights, secretly put the Vision Diluc had left behind into a vase and returned it to him.
That was why, even now, a rather out-of-place vase could still be seen in the grand manor at Dawn Winery. It was the one Kaeya had given him.
The Knights had indeed had serious problems back then, and their handling of his father's death had been wrong.
But after Jean took charge, she