Liberator Badge
From City of Heroes: Rebirth - Wiki
Description
You have freed the captured heroes, preventing them from becoming devoured.
How to Get
Complete the Eden Spire Trial from the Woodsman.
Gladiator Badge Unlocked
When you earn this badge, you will unlock the Boulder Gladiator badge.
Note
The Liberator badge is awarded to characters of the hero and vigilante alignments. The same badge on villains and rogues is called Destroyer of Earth.