In Co-Op mode, you can tag team with another player to brave against the tough wave of monsters and bosses to collect a special item currency called Ruby. The further you and the partner progress in the Co-Op mode, the more rubies you will earn. Regular players will be able to challenge in Co-Op mode up to 5 times a day, whereas Battle Pass holders will have unlimited attempts in Co-Op mode.
Rubies can be exchanged for a ruby box for a plethora of rewards.
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