Shattered Destiny — Shay West

In the second book of The Portals of Destiny series, the Chosen have teamed up to learn about each other's worlds. But things on their home planets are not as they left them. Astra is plagued by a genocidal maniac, Earth's Jhinn are worse for the wear after losing their General, and Volgon is turning over a new leaf. Meanwhile, the Chosen discover there is a lot about each other they don't understand, and that makes fighting anythingâ€"let alone the universe-threatening Mekansâ€"difficult. When more of the Chosen die, the question becomes not how will the Chosen defeat the Mekans, but can they?