The Keys to Ashdevelon: Book 3 of Saltwater Series

There is no time to lose for planet Earth. A huge fracture has appeared in the atmosphere and unseen vampire-like creatures are streaming through to further delude and disrupt a struggling humanity. The fault is caused by a shuddering off-balance swing of the Earth and Finn knows that something about the orbs has the power to steady the pending disaster. His deep sea relatives who see him as their half-born hero, are intensely focused on retrieving them, and he is shocked to discover they rescued them eons ago from their home, once a thriving water planet like the Earth, but now reduced to dead asteroid fragments cycling the sun between Mars and Jupiter.
Though he does not fully understand the nature of the orbs, Finn knows he must develop abilities he never knew he had if he is to stand the slightest chance against an evil and insane human faction who are desperate to possess them.