Board Thread:Off Topic/@comment-26397825-20170410034737/@comment-30530552-20170420232733

Akin to what Yang does with her power (or so it would seem). You tap into it (with a single cost of Aura for some unknown percentage), it runs its course, you finish.

Guesstimate would probably be like, 5 to 10% of Aura dedicated to activation, and nothing more added to it. It's not a constant drain of Aura, how about that...? Does that explain it better?

The other possibility is giving it another upside to justify a running cost.