My current stellaline is going out of date so to speak, but it has 2 slots > Arm and body. In these slots is a power and guard unit. I have my megaline off of my old character, but it only has an arm slot. The Yohmei armor that I can't spell is supposedly the best you can buy from the shop, but it only has head and body.

I don't wont to give up power or guard so I'm wondering if through synthesis one can place on as many slots as they want?

And if not, I'm not sure what unit to leave behind as both as pretty important x_x.