In the Nightborne recruitment scenario, the Void ethereals exploited Alleria Windruner's Void powers to twist the Sunwell into a beacon for their invasion. But what's stopping the Light forces from doing the same thing?
The Sunwell is a massive source of pure Light energies. In an hypothetical Lightbound invasion, could Quel'Thalas immediately fall to the Lightbound invaders, after they have used the Sunwell as a gateway into Azeroth (similarly to how the Void ethereals did thanks to Alleria's presence)?