Sorry if my wording was confusing. I did mean Piece of Crystal for SP summon.

I want to save up and spend them all at once when I have enough for a 90+% chance of plat so I feel like I'm buying one instead of gambling for it. I know my chances are no better if I save them than spending them right away but it makes me feel better (dumb, I know).

I also need more room for units. I shouldn't seeing as how I'm a free player and have the second barracks but I'm still full of shit I don't want to sell off. I just sold 60 gold spirits because I needed the room.