You and your fellow comrades are teaming up to fend off the oncoming monsters trying to make their way back into Somberwood Citadel. You and your team have to survive the massing waves as they continue to barrage the gates. Can you survive the Onslaught? Onslaught is a cooperative tower defense game for 1 to 6 players. Each turn more enemies will spawn, but that's ok because in between waves you can go salvaging to upgrade your turrets to make defending easier. At some point The Maker will send one elite monster, or maybe he will even show up to try to finish the job. If you can stop them then you win and have successfully driven him from his castle! A turn is comprised of multiple phases. The first phase will have all players adding weapons or support cards to their own personal pillbox. The second phase will have monsters advance, followed by having new monsters arrive. The third phase is fending off all monsters visible. Players, in no particular order, will take turns targeting a monster they wish to shoot. If their roll is successful, they damage the monster according to their weapon. If they miss, nothing happens and another player may shoot. Instead of shooting, a player may support a teammate with one of their shots adding extra accuracy. These steps repeat until the elite monster is defeated causing the players to win, or until a single monster has re-entered the citadel causing the players to lose and have to try again another day.