The Guard Meter. Currently the meter is partially depleted after an attack.
The Guard Meter is a blue meter for the Guardian Fighter class that is visible to the left of the character in the HUD. The height of the meter indicates the Guardian Fighter's current ability to block attacks with his or her shield. The Guard Meter decreases as the Guardian Fighter blocks attacks. When the meter reading reaches 0, the character is unable to block further attacks. The Guard Meter regenerates over time, but certain powers such as Tide of Iron can replenish the meter faster while in combat.