The Void is nothing - and it is everywhere. Everything disappears. Only Essence can stop it. And Void somehow knows it - and sends Demons to deplete the Essence Source. Lead your fleet from island to island and repell Demon forces. Put your units in right places, use their abilities and create Towers to protect the Essence Source and destroy Demons' buildings. Plan and exequte before Demons take over the island. Resolve encounters and upgrade your fleet to survive ever growing strength of the Void. Be strong - you are the only Essence Defender in this sector!