Well this isn't a card game. In this case, it would be a cone of damage/healing.
Forked Lightning could be a nice DPS booster for Elemental. Blizzard could then give Resto and Enhance similar DPS and Healing boosts in those specs. Enhance could get Tornado for example, a talent that increases power based on their MW stacks, and Resto could get a version of Forked Lightning that deals damage, heals allies and works off of Telluric currents.
I mean why not? Other class get similar abilities.