In war hit first and ask questions later.
Rush in one direction. Destroy just about every normal enemy you run into and do heavy damage to bosses (damage numbers do not display, so amount of damage inflicted is unknown). At the end of your rush, you get frozen for about 8 seconds - cannot move, cannot attack.
This QR Code will upgrade your Nexo Power to 5 Stars. Each time this page is refreshed, a new code 24-hour QR Code will be generated.
If you receive the "time zone error message", click on your offset to generate a new code for your timezone.
If your region uses Daylight Saving Time, you may need to click on the time zone that is 1 hour earlier to get a QR code that will work.