StarCraft 2: Legacy of the Void is an addition to the real-time strategy StarCraft 2: Wings of Liberty from the developers of Blizzard Entertainment. The addon includes a story campaign for the Protoss, a cooperative Archon Mode and several new units for multiplayer. The story campaign picks up exactly where Wings of Liberty ended. Protoss Artanis and Zeratul will strive to unite their race against the intergalactic threat. In co-op, two players control one base and strive to protect it from enemies. By correctly dividing responsibilities between the troops and agreeing on a battle strategy, players will be able to achieve victory. Another game mode, Allied Commanders, is also related to co-op. In it you can play as commanders from the StarCraft series. Each has its own abilities and special bonuses that affect units.