The Last Wizard at The End of the World by M. Wallace Maguire

the last wizard
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Young Arestus lives comfortably in the kingdom of the Pale Prince, until his friend Cirin embarks on yet another adventure this time across the seas. The pair are shipwrecked on the island of Hallowell, a kingdom on the brink of war. Their only hope is an exiled Wizard who lives at the end of the world, but can Arestus reach him in time? Discover what new adventures await in this much-anticipated sequel to, "In Pursuit of The Pale Prince."