I just read this like right now and i was intrigued. So when Douman is initially revealed to be evil in front of the minister of the left, he says Lord Urabe's caster was a great exception because it was a servant worthy of a Holy grail war, who was Urabe's servant cause up to now. I haven't seen them hint at anything, and i just wanted to know. Cause i live knowing all the lore details.