Stamina is used up by completing missions To complete every mission and special assignments, players need stamina. It is required for various skill training as well. Stamina re-gains is rebuilt over time at a set rate.  MaxIt can be bought for diamonds as well. Stamina timer can be increased reduced on obtaining certain special items by spending skill pointssuccessfully completing Special Assignments.* Call of Cartel - The Medicine - 15% Reduction* River of Blood - Purple Fury - 15% Reduction* Lab Down Under - Stamina Booster - 40% Reduction