What does the Caduceus Staff do?The Caduceus Staff's healing function is bound to Mercy's Primary Fire which is by default. You must have the Caduceus Staff out to heal.
Mercy's Caduceus Staff is able to heal allies or boost their attacks (we will focus on healing allies.) She is able to heal any ally within 15 meters at 60 health per second. This will cast a yellow beam (from you to the target) which will give away your position.
Her ultimate, Valkyrie, will allow her to fly, increase the length of her healing (so she can heal from farther away), and will tether the healing beam to any nearby ally. It also gives you constant health regeneration, increasing your ability to survive.How do I earn this achievement?
Teams are made of 6 people (you included) so you will need to restore 200 health to all of your allies. Since you must do this without dying, positioning is key. Try to stay near the team and out of sight of the enemies.
Try to be aware of any flankers. If you take damage, retreat and allow your health to regenerate (this is a passive skill for Mercy.) Remember that you have the Caduceus Blaster (it does 20 damage/.2 seconds.)
Valkyrie is the key as it enhances your healing and your ability to survive (some details above). In Valkyrie state, beware of McCree's High Noon and Soldier: 76's Tactical Visor as well as snipers like Widowmaker and Hanzo.How do I boost this achievement?The Six Stack
1. Form a group with your friends and enter a match.
2. Choose Mercy and have your friends choose Tanks.
3. Allow them to take 200+ damage and heal them. Rinse and repeat with each person.The Lockdown MethodThis is the most common method to boost Overwatch that requires 12 people.
*Spectators will only fill allied spots.