Shadow Master Badge
From City of Heroes: Rebirth - Wiki
Description
Though Black Swan attempted to tear open the barrier between Shadow Earth and Praetoria, you stopped her shadowy suffusion before it could overwhelm your League and stain your souls. You are a true Shadow Master.
How to Get
Requires a VIP subscription.
During the battle with Black Swan in the Magisterium Trial, never allow her to open all six Shadow Rifts simultaneously, then complete the trial.