The ability is called Aetherflow, it restores mp and gives the aetherflow effect (that gives you stacks of aetherflow that other abilities use)

The other way is a skill called Dissipate that you unlock at level 60. It’s a skill that “eats” your fairy for 30 seconds (meaning you temporarily can’t use any skills that are from the fairy like Whispering Dawn) in exchange for 3 aetherflow charges, and has a cooldown of 180 seconds. So it’s not your bread and butter Aetherflow that you should be using on cooldown, but it’s still a useful skill in a pinch if you need some more healing but Aetherflow is still on cooldown.