Most items have potential . Potential can be revealed by clicking the magnifying glass icon in the inventory window and paying some mesos . You can have up to 3 lines of potential . Because potential lines give stats like X % boss damage or Y % stat , they make up a majority of endgame power . Cubes just reset the potential lines and randomize them . Kind of like what super sea snails do to gear abilities in Splatoon . There are 4 potential tiers rare , epic , unique , and legendary in that order of power . There are also 4 types of cubes master , meister , red , and black . Master cubes only work up to unique potential , the other three work on any tier . Black cubes are special in that they allow you to choose between before and after potentials . Cubes also have a chance at raising the potential tier of an item black cubes have the highest chance , and mastermeister cubes have the lowest . Cubes cannot add potential to do that , use a potential scroll , nor add lines of potential use a potential stamp for that . They just randomize them . There ' s also bonus potential , which is identical to regular potential except it can only be reset with bonus potential cubes . And finally there ' s two special cubes , white and violet . You can pretty much ignore these for all intents and purposes since they ' re event only and not sold yearround . In nonReboot , mastermeister cubes drop from bosses , drop from legendary mineral veins , can be crafted , and can be earned from sudden missions and bounty portal prizes . Red and black cubes can be bought for NX cash or for reward points . In Reboot , mastermeister cubes can be earned through all of the above except crafting , and can be bought from general shops . Redblack cubes can be bought for mesos or reward points in the cash shop .