The School of Awkward Magic. How to Unspell the Principal

Ribizel is a hereditary wizard, but studying at the school of the Split Star is not easy for him. After another failure, he is summoned to the principal's office and given the news: now Ribizel has to study in the... dungeon for the failures.
 
But then - bang! - Ribizel accidentally turns the principal of the school... into a frog.
 
To unspell him, Ribizel and his friends will have to embark on a dangerous journey through the Split Lands, gather stardust, and increase their level of magic. They will face quests, battles with troll-bruisers, crumb-devourers, and grumpy-cats, as well as true friendship, courage, and a bit (well, okay, a lot) of magic. 
 
Will they manage to complete this task? Or will the principal remain a frog forever?