LEGO 71423 Dry Bowser Castle Battle Expansion Set - CertifiedLEGO 71423 Dry Bowser Castle Battle Expansion Set is a 1,321 piece Super Mario set with 5 figures released in 2023. It consists of a LEGO castle with features like a Bowser jaw entrance, crane, flippers, Magmaargh attack function, gym, secret rooms, Key Block, and a Treasure Chest Block, along with Dry Bowser, a Magmaargh, a Bone Piranha Plant, a Bone Goomba and a Purple Toad. It was retired in November of 2024.