The Biome Wars have begun Mobs fight one another to claim the keys that open the smoking box, a mysterious vessel that is said to contain either the mobs' savior or their destruction. Sack the spider guarded the Biome Tower, the center of the Biome and home of the feuding Mobcil, when the war happened. He and Domino, the skeleton who found the smoking box, worked together in an attempt to get the box out of the Mobcil's hands. Now, Domino is ash and Sack is soon discovered to have been a conspirator with him. After escaping from the Mobcil and the war, Sack is summoned by Arachna the Spider Queen. Arachna says she'll forgive Sack on one condition: he has to spy on Scopi, the leader of the scorpions. Can the usually peaceful spider do it, or will he get the stinger? Find out in the new exciting installment of Biome Wars.