Once the headquarters for infamous mad alchemists, Thunderhead Fortress now stands empty and unguarded. Within its labyrinthine halls, however, awaits untold wealth and many mad contraptions! Thunderhead Fortress is the original starter map for Riot Quest, now in neoprene fabric made to endure even more madness! Shipped rolled in individual tubes, Thunderhead Fortress fabric playmats measure 27" x 27" when flat.