Try connecting your device to a power source and leaving it for at least 2 hours. Sometimes the battery power could be so low that it takes some time before the device can be responsive at all.
If iOS on the iPod is damaged and cannot boot up properly, it can be restored safely without losing your Graal character as the account is linked to the device UDID. You can force the device to start in recovery mode by holding down the home button when it is powered off and then connecting it to iTunes (while keeping the home button held down).
(I have also sent further instructions to you via PM)