Ancestral Bow looks like Mari's "Grandfather's Bow". These data mine threads keep making Nao's story look weirder and weirder.
Okay this is too heartbreaking for me to look at. Q.Q I've been sacrificing virgins to Devcat for the Bryluen set and they never released it! Q>Q This is way too tempting!! Gah!
The Broken Horn stuff does have set effects specified, but they aren't displayed in-game for some reason, unlike Dustin, where it is displayed by default.
Angel's feather was there to create a unique dungeon apparently.
Like no matter what you drop, it created a unique dungeon that couldn't be entered.