Siege-Heart of Darkness CCG set

 Siege: Heart of Darkness  was a self-contained cooperative variant of Legend of the Five Rings Card Collectible Game, with multiple players opposing a challenge deck piloted by another player. The Dark Naga challenge deck included new cards with no arc legality; the three pre-constructed decks included cards legal throughout the Ivory arc, from Coils of Madness through A Line in the Sand. The set introduced Clock and Territory card types, which are only relevant to the Siege format. It depicted the Siege of the Second City by the Dark Naga and his minions who driven from the Empire had emerged, near the outskirts of the Second City.