Mage Errant, book 1: Into the Labyrinth
John Bierce2018

Hugh of Emblin is, so far as he's concerned, the worst student that the Academy at Skyhold has ever seen. He can barely cast any spells at all, and those he does cast tend to fail explosively. If that wasn't bad enough, he's also managed to attract the ire of the most promising student of his year- who also happens to be the nephew of a king. Hugh has no friends, no talent, and definitely doesn't expect a mage to choose him as an apprentice at all during the upcoming Choosing.

When a very unusual mage does choose him as apprentice, however, his life starts to take a sharp turn for the better. Now all he has to worry about is the final test for the first years- being sent into the terrifying labyrinth below Skyhold.