And the only reason I know the welsh name (which is Caledfwlch, by the way) is because I play a mythical Welsh bard who kept company with King Arthur |D
I'm just imagining Asfour trying to explain it to Leonardo and Leonardo going "Actually, I know what this is" and then goes into intricate detail about its workings
Oh! I completely forgot about the assassin statues in the basement of the Villa, you could have Asfour carry the spear of Wei Yu, the bow of Qulan Gal, the dagger of Leonius
these things may or may not be arranged in the chamber he has his desk in in the exact same order as in the Sanctuary, only the Altair statue is replaced with the doors to his garden/sparring ring
or he's a Vengeance demon partially because he owns themeaster eggthe only reason he goes to Asfour's house in the first place is so that he can get another glimpse of Alcuinpining lovesick idiotthe house of flying daggers