https://heromages.com/gameInfo/magicalSpells.htmlValor
Hero Mages is designed to reward active and aggressive game participation. As an incentive to emerge from your defensive starting position and engage players in combat, you earn Valor, which activates your Mage’s special abilities. The more you engage and are engaged by enemy players during the game, the greater you put yourself at risk, the more courageous the game considers you to be, and the more you are rewarded for your actions. Players earn:
1 Valor for each attack made against an enemy unit (Max of 3 per round)
2 Valor for each enemy player beyond the first attacked during a round
4 Valor for each enemy player beyond the first that attacks them during a round
The amount of Valor required to activate an ability will appear over its icon until the power is activated. Valor you have accumulated thus far is indicated by a counter to left of your spells and in each player’s summary tile. You no longer accumulate Valor if your Mage is defeated.