Gem
Gems are one of the 2 main Currency aside from 
Gold . They are most commonly used for summoning units.
They can also be used to buy bosses from the PvP boss store, which can be used to summon amogus in a PvP match. Furthermore, Gems can be used to some buy orbs, and the orbs that are purchasable with Gems are used to buff specific units. After surpassing 145B damage, the damage task increases from 15 to 25 gems.
These are the current ways that players can get gems:
- Completing Story Mode maps
- Claim a reward from completing the Tasks/Daily Tasks
- Playing PvP Mode
- Playing Infinite Mode
- Playing Ticket Quest
- Being AFK in the Time Chamber
- Redeeming a Code
- Daily Rewards
- The Star Pass
- The Tower Mode
Currently, you can purchase gems for 80:50 Robux per Gems respectfully before discount.