Scott Davis 
War of the Elementals #4 [EPUB ebook] 

It’s all be leading up to this! The world as we thought we knew it is gone and the planet is under a constant barrage from the wild Elemental beasts. Even the 5th Squadron seems fractured beyond repair. The great rift between the realities is growing and has reached the tipping point. In this final chapter of the fantastical and phantasmic WWI epic adventure, the squadron faces momentous decisions of life, death, and sacrifice in one final push to bring the world back from the brink.