Shadow Walker - Defenders of Asgard (book I)

I had a new client, Jonas Martin, a Swedish author (https://jonasmartin.mykajabi.com/shadowwalker)
The cover features Dash, a demigod teen with Asgardian powers. He uses dark magic, which I depict like a black hole. As you may know, a black hole's gravity is so strong, it even distorts (or completely pulls in) light rays. He also possesses a magical Viking dagger.
Book II here:
https://www.artstation.com/artwork/lDGxvV
Defenders of Asgard: Shadow Walker is the first book in a fun YA fantasy series based on Norse mythology, featuring compelling characters battling zombies and monsters in the underworld, surprising plot twists, and kick-ass demigods with awesome magic and weapons—and magical weapons. If you like Magnus Chase or Percy Jackson, you’ll love Jonas Martin’s brand-new fantasy adventure!