I can't be the only person who thinks having a second aura slot would be great for character customization. Cryogenic fog sheeting off your ice/cold corruptor, while supercooled slush drips from one arm? Rocky crumble and flaming eyes for your seismic/fire blaster?
Maybe a new mission from the Icon shop to unlock it, much like the extra costume slots.
You might say the costume powers you can buy with Prismatic Aether lets you do this. Those are all full-body effects, though. What if I just want glowing eyes and sparking fists? Is it too much to ask?
If there's some issue with costume effects being too busy or overlapping, this "minor" slot could have none of the "body" aura options. Just eyes, head, fists, and whatever. Or, hey, just let us go wild. There's already plenty of silly things we can do with character customization. How about it?