The Eighth Excalibur by Luke Mitchell

Nate Arturi was nobody’s first choice for a hero. But when a homeless wizard tricks him into taking up a foul-mouthed Excalibur to fend off the Troglodan apocalypse, he’d better learn quick… “Sci-fi meets Camelot. Plus a cool Corgi. What more do you want? Stop reading this and go start the series!” – L. Watson