Can't say I'm the best teacher for that- Lailah can explain that a whole lot better. [ Especially when Rose is the kind of person to continuously doze off during lessons... ]

It's got a lot to do with skills some equipment have. Fusing the same kinda weapons can transfer some skills over, depending on what and where it can replace over.. or even make a new skill completely. Things like that.

She'd be able to show you, I have no fusing skills whatsoever. [ Arms cross behind behind his head with a pondering look. ]