Enter Portal 2

Enter Portal 2: Attack of the Raekeem is the second book in the series by A.J Elksnis. Lana and Rachel face a new threat; a war-like alien race known as the Raekeem! Earth and it's allies; the Kiyol and the Laicians battle the invaders, in this all-out, do-or-die, interplanetary war against the evil Lord of the Raekeem and his deadly Sentinels!