Dooming a player is an immediate effect. Each Horseman type will apply a different effect when dooming. When a Horseman attempts to doom another Horseman, it fails: the two Horsemen unite, joining a shared channel. Doomed players are informed that they have been doomed, but not which Horseman doomed them. Doomed players can be doomed again by the same or a different Horseman. Dooming and its accompanying effect will immediately disappear when no Horsemen remain. When all remaining Horsemen are united and all remaining players doomed, Doomsday is unleashed: Each living Horseman turns into an Apocalyptic Horseman, with the ability to attack a player each night.

The Horsemen is a team usually consisting of around two to four players. The Horsemen can either start out as the Horseman role or as a specific Horseman, but never as an Apocalyptic Horseman. The goal of the Horsemen is to kill everyone, however they only gain a killing power if they have doomed all aligned players. Dooming a player has a different effect depending on the type of Horseman. At the start of the game, the Horsemen do not know each other, but if a Horseman attempts to doom another Horseman, it fails and the Horseman unite instead. When that happens they both keep their powers, but join a shared Horsemen channel and can now coordinate their actions. United Horsemen are considered to be doomed, which is relevant should they lose their role. If there is only a single Horseman (left) and all other players are doomed, they become an Apocalyptic Horseman. For a list of Horsemen run $i horsemen team.