By using the spell learn from the second stage :)
i deleted the game a while ago and re downloaded it today...and i started a new game, finished all the tasks including the goblin king...i talked to the girl she said "new tasks" but when i checked it was still the same...i wanna cry :(
you can delete the old .save file in %yourusername%\AppData\LocalLow\windofdaybreak\dancingreaper\
and the restart a new game
k