Chapter 396 - Corrupted core

"As you all know," Elora began her explanation, having entered teacher mode. "More powerful affinities have proportionally powerful corruption effects, which is why corruption isn't much of a problem in most Arcanists." 

She mentally indicated towards Emma and Emily, "You two have fifth rank affinities, which are both very dangerous. Fortunately, I've been able to guide Emma from the start, so she hasn't had any problems with it. And she won't, so long as she remembers the things I've taught her…" 

"I will!" Emma promised with an uncharacteristically serious expression. She'd been warned about the possibility of light corruption essentially burning away any and all emotions, and the thought terrified her. She was fine with growing slowly, but steadily. She didn't care much about power anyway.