Cubits () is the in-game currency that is used in the store, along with credits () (the real money currency). You can earn them by logging in daily and completing daily lairs and dungeons, which will fill up the progression bar in the right upper corner of your game. Alternatively, you can get them from mastery at certain levels. 500 are earned for filling up the star gauge on weekdays, and 1000 on weekends.
Cubits can be used to buy things like: