I like Avatar the last Airbender (and Legend of Korra) so much , I just wanted to share an idea I got from watching the show:
Elemental Unity
Unifies all elements for a brief period of time, granting boons and alacrity.
Gives 5 stacks of Might, Regeneration, Swiftness and Protection for 10 seconds to the Elementalist.
Reduces Elemental Attunement cooldown by 50% (80% if you have 6 points in Arcana) for 15 seconds.
Cooldown: 90 seconds-ish?
Visual Effect: makes your eyes glow with a powerful white hue.
If you are a fan of the show you will get the visual effect hint ;p.