Fought Jade Oni. Won. Advised me to talk to the Emperor on the stage but he has no ? or ! above his head and it won't let me turn in the quest. Fought Oni Jade after restarting computer and still nothing. Any help?
I'd suggest contacting Kingsisle's Customer Support about this issue. Last I checked, the email address was support@kingsisle.com. Contact them there and they might be able to help.