There are following resources in the game:
- Food (or sometimes Meat) and Rage that you use for fighting. Food are used to enter map levels and rage are used for PvP. They replenish with time: you regain 1 food every 2 minutes, and 1 rage every 30 minutes.
- Life and Void Crystals are used to enter guild Raids.
There are also special resources during seasonal events. These resources are collected during regular PvE battles or awarded in a special seasonal Tournaments. They are stored in army screen. You can use these special resources during seasonal events to open seasonal crypts. Opening a seasonal crypt usually cost 1000 of these resources, but you can open it with 750 gems as well. The special resources are reset between events so use them if you can.