Call to Arms is an activated ability by the Countess. It drains mana at regular intervals until the character either runs out of mana or turns the ability off.
The ability causes the character and all allied characters nearby to gain a boost in damage. The Countess also runs faster and takes less damage while this ability is active.
This ability is best used when attacking large groups when mana collection isn't important. The collected mana can easily keep the ability active non-stop as long as there's creatures to kill.
The approximate damage boost that this power gives it 1.75x or 175% or 75% increase.