Sonic and the Curse of the Sun Stone

*AU* Set one month after the events of "Sonic and the Power of the Wisps" and during the events of "Sonic in Between": Despite being home from his Isalenna adventures for a week, Sonic arrives in the Kingdom of Soleanna. But soon finds himself facing a new evil enemy who seeks it's princess and it's ancient Sun Stone which holds a dark secret. (NOTE: No, it's not a romantic story)