While you were poking around in some abandoned, ruined place that others of your people avoid, you comes across a hidden cache of ancient treasures, start with maximum starting gold for your class. (work with your DM to determine details)
A potent conjunction of the stars and planets occurs on your birthday. you are struck by a falling star which passes through your body like it was made of mist. you awaken feeling different, as if something has been awakened from within.