Heir of Mjölnir (The Dragon Hunters #4) - The Dragon Hunters, #4

The servants of Hecate have been subject to persecution for many years. They have been misunderstood, accused of worshipping the devil. And Hecate has had enough. The Devil, Lucifer, has finally invaded the human world and his true servants, warlocks, are growing bold. Lucifer's influence has spread throughout the world and nothing is the same as it was before he came. There are those that can counter the power of the warlocks, and Hecate may have found one.
Vax King had just graduated high school when the world changed. And unlike everyone around him, he saw through the lies. The world was trapped in the spell of the father of all evil and he seemed to be the only one in the immediate area that could see it. Then again, he's a solitary witch and no one else knows it. But he's shocked when the goddess Hecate appears to him with a quest to gain a weapon to help fight the forces of evil.
The weapon is the legendary hammer of the Norse god, Thor, Mjölnir, and if he can find this he can lead the forces of Hecate against their greatest enemy. But to gain it, he must survive the Rose realm and prove his worth. Should he fail, death is all that awaits. Can he prove to the enchanted weapon of the deceased god that he is more worthy of wielding it than the original owner, and therein become the leader of an army of witches ready and waiting to stand against Lucifer?