I would rather see a buff that would temporarily alter the appearance of the fairies. Have them transform into larger humanoid beings whilst enhancing their capabilities for a limited amount of time or until an "Ultimate" skill is used. The "Ultimate" skill could be a revive for EOS and a haste/slow AOE field that would be similar to Sacred Soil in size and use.

The transformation would consume 3 stacks of Aetherflow and the Ultimate skill costs nothing (since you've already used 3 stacks of Aetherflow).

It's ambitious, but that's what I would hope for. Something grand and unique to further differentiate classes.