The Excalibur Talisman: A Post Apocalyptic Thriller - The Calling Chronicles , #4

Lazarus had mistakenly released the Vvong Queen, Morgana, from her magical bonds and she's racing back to earth to exact her revenge. The only people who can stop her was Lazarus and the Alpha Mages. In this last installment of the Calling, Lazarus and the Alpha Mages has to find Merlin and Excalibur and defend Earth against the threat of invasion by the insectile race of creatures, the Vvong. The magical races with Duke Grendel leading them is hurrying to defend Earth with his fleet of spaceships.
If you love a book filled with magic, adventure and excitement, then you would love the ending of this top-selling urban fantasy series.