"Chain Experience Bonus Campaign - PLUS!
Earn from double to three times the normal amount of experience from experience chains. Not only that, but the maximum benefit of Dedication from items will be doubled during the campaign!"
I just leveled 1-33 burning up 2 charges of Echad ring, which totals 118kish exp. If the bonus of each Echad ring was doubled I would have gotten 120k bonus from those alone. Empress band is working on double though.