Aerial Crusader Chain of Empathy

 is an uncommon vendor item in the neck class.

Obtained from

 * Aquaman in the Magic Wing (Watchtower)
 * Hawkgirl in the Meta Wing (Watchtower)
 * Robin in the Tech Wing (Watchtower)

Trivia
A necklace with PvP item level 77 is a must-have to complete PvP level 77 and unlock PvP level 81 gear at the vendors.

The item is available since game update 25.