合成システム
gitbookより
Every gear/gun has 6 rarity: common, rare, elite, epic, heroic, legendary
Fusion is a feature to rank up item's rarity, if you reached the highest level of an item in one rarity, you can fuse that item to next higher rarity by sacrificing a few other same type of items
Common to rare : sacrifice 2 items
Rare to Elite: sacrifice 3 items
Elite to Epic: sacrifice 4 items
Epic to Heroic: sacrifice 5 items
Heroic to legendary: sacrifice 6 items
Everytime fusing a gear/gun, its rarity will rank up and its base stats (atk,def,...) will be increased.