Originally Posted by Crimsonred
Lemme let you guys in on a nice new stuff:
With Custom slot extenders now you can unlock custom slots so you can make your SR/AR ranks C3 and your CS ranks C4 now.
Hmm the list is...:
等級 아이템 필요 개수
C2-> C3 C3-> C4
SR, SS, S 100 N/A
AR, AS, A 60 N/A
BR, BS, BU, B 40 N/A
CR, CS CU, C 15 25
Save me the trouble and search next time please.