Antagonistic Charm of Imperator

 is a rare trinket available from the PvP vendors.

Obtained from

 * Requisitions-T234-HA in the Hall of Heroes
 * Requisitions-T234-VA in the Power Core (Hall of Doom)

Trivia

 * A trinket with PvP item level 89 is a must-have to complete PvP level 89 and unlock PvP level 90 gear at the vendors.