Incursion is a campaign expansion book for Deadzone that introduces two new alien species to the conflict and also outlines rules for multiplayer games to expand beyond the two-player core rules. From the publisher: The conflict on Nexus Psi escalates with the arrival of the dour Forge Fathers and the mysterious Asterians! Pursuing unknown agendas of their own, these two factions bring their own respective brands of urban warfare to the Deadzone! Also includes rules for multiplayer games to reflect the increased conflict