Vera, Steve. Last of the Shardyn #bk. 2

A dark god, a police chief and four knights walk into a portal... Ex-commando and Montana police chief Skip Walkins's life just got a whole lot worse. The malevolent god Asmodeous the Pale has escaped to Earth's magical twin, Theia, where he plans to release his underworld minions and enslave mankind. Skip, in a fit of unwise bravery, follows. He ends up allied again with Gavin Blackburn and the Shardyn Knights. Desperate to warn the Theians about Asmodeous, the Knights don't blink at crossing a sky-high mountain range and battling a legendary necromancer to do so. The thing is, nobody wants to listen to the Knights' tales of dread. Immersed in a magic-fueled tournament for immortality, the Theians give Gavin and Skip a motley crew of mismatched warriors to lead against all the fury of the underworld. And if Gavin and Skip can't stop Asmodeous, both Theia and Earth will be doomed

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