Mercy grants a teammate either healing or damage boosting. Primary fire projects a yellow beam that heals the target at the rate of 60 HP per second. Alt-fire projects a blue beam that grants the target a 30% increase to their damage output. Both beams will tether onto the target. The target's name and health is displayed below the crosshairs. Mercy is able to fill her ultimate charge from both healing and damage boosting. However, she cannot build her ultimate charge if she boosts heroes who are attacking themselves, Mei's Ice Wall, barriers, etc.