The appearance of the mana bar.
Mana, represented by a blue bar in the interface, is a pool of energy that is consumed when casting most skills. All demigods have a mana pool, and all characters have skills that utilize mana, though some have more available mana and mana-using skills than others. Mana will regenerate slowly over time on its own, though there are many skills and effects that can increase the rate of regeneration. In addition to effects that increase mana regeration, there are effects that manipulate mana in other ways, such as Hungarling's Crown's -35% Mana cost aura.