Lost Savior Badge
From City of Heroes: Rebirth - Wiki
Description
With the help of the Midnight Squad, Dawn Patrol and even a Rikti scientist, you've done the impossible. You've found a cure for the Lost.
How to Get
Badge awarded for completion of the Cure Lost mission from Montague Castanella.
Villains can receive this badge by being in a cooperative zone, teamed with the mission holder, while the mission holder drops the Cure Lost mission.