LEGO NEXO KNIGHTS 70321: General Magmar's Siege Machine of Doom

General Magmar's Siege of Doom, set #70321.  Missing one piece (one of two black helmets - piece #4226000).  Also, minifigure Clay Morrington is missing one of his hands (see photo).  No box but both manuals included. They are in great condition aside from pencil marks on two pages (see photo). Set comes unassembled.   About the set: Lift the back of General Magmar's 2-in-1 Siege Machine of Doom, featuring 2 platforms and giant wheels with spikes, to switch the vehicle into siege mode. Fire the dual catapults and disc shooter to knock Clay Moorington off his Hover Horse. Use the swords to play out battles on the ground as General Magmar and Flama take on Clay with his Claymore sword for the Book of Destruction.   Includes 3 minifigures: General Magmar, Flama and Clay Moorington. General Magmar's Siege Machine of Doom features 6 large wheels with translucent- red flame elements and spikes, monster teeth, cockpits for General Magmar and Flama, dual catapults and a disc shooter. The Siege Machine of Doom's 2 catapults and disc shooter can be fired in both vehicle mode and siege machine mode.