This is proof that you've equipped items that activate a Group Union bonus skill. Each basic skill group has a skill corresponding to each of the five elements. It doesn't matter where on your equipment you have the skills equipped; just equip all five skills in a group to form a Group Union!

Steal successfully with Rikku 200 times

Join the Railroad

Complete "Mechanical Menace"

Follow all threads of fate to their inevitable conclusions.

Play in the ocean near the sunken ship

Spawn 10 Sidekicks in Multiplayer

Defeat 50 enemies from-the-hip or blind-firing

Play with the lemur in the market and let it steal your apple

Pull 20 enemies over when hanging from a ledge

Find a Journal Entry

Defeat Vordt of the Boreal Valley.