I currently have 15 Caligula Shaftshards that I'm not entirely sure where I got them from. I know I'll be needing them for making weapons later so I'd like to farm them while I have down time. I've tried Dio Hyunal runs in Ultimate quest like the Wiki says but I haven't managed to get any to drop. Does anyone know for a fact what drops them? I appreciate the info.
EDIT: This is on NA servers by the way.