Perhaps there can be three "elements" (subclasses) that determin the main playstyle of the class, with a few primary elements that are available to all, 

Such as the Arcflow, we could reflavor it as a build up of energy until they are able to "atune" to their element, and then have different abilities around that? However that might have some issues, 
sane with AetherDash, I love it as is giving a boost of momentum that moves them without provoking opportunity.

What we discussed for "Arcstrider" could be an element for it, 