70504 Garmatron 70504 Garmatron is a Ninjago set released in 2013 . It contains 328 pieces and 3 minifigure s . Background . When Lord Garmadon first met the Overlord , the latter promised him an undefeatable weapon of colossal power . The Stone Army began mining Dark Matter for the weapon ' s construction ; later , the Overlord stated that when the Celestial Clock completed its countdown , the ultimate weapon would be complete . In Return of the Overlord , the Garmatron is finally completed , and Lord Garmadon pilots it to the coast of the Island of Darkness . From there , he uses the Garmatron ' s cannon to launch Dark Matter missiles at Ninjago , infecting parts of the land with darkness . After a few shots , the balance between light and darkness in the world is upset , allowing the Overlord to re - take a physical form using Garmadon ' s body . In order to increase his power further , the Overlord aims the Garmatron ' s next projectile at Ninjago City , but the Ninja attack the Stone Army to prevent them from loading another Dark Matter missile . General Kozu attempts to stop them , but Sensei Wu kicks him into the Garmatron ' s loading bay , causing the Overlord to mistakenly fire his subordinate into Ninjago City . After a fight with Lloyd , the Overlord decides to attack Ninjago City directly , opening a portal and leaving with the Stone Army and an infected Nya . During " Rise of the Spinjitzu Master " , the Garmatron appeared in the middle of Ninjago City , where it began firing Dark Matter all over the place with its side - mounted turrets . The influx of evil further empowered the Overlord , allowing him to regain his true form . In this state , the Overlord transformed the Garmatron into a massive fortress from which to oversee his new kingdom . When the Ninja returned to Ninjago City , the Ultra Dragon drew the Stone Army ' s attention long enough for Lloyd to breach the outer wall of the fortress with the Golden Mech . Before further damage could be done , the mech was destroyed by Nya , manning a turret on the outer staircase of the tower . After the Stone Army fell under the control of Dareth , the forces of light ascended the tower , although the interference of the remaining villains left only Lloyd to reach the top . After an epic battle with the Overlord , Lloyd unlocked his true potential as the Ultimate Spinjitzu Master , allowing him to defeat his dark nemesis . When the Overlord was destroyed , the fortress that was once Garmatron disappeared as well , leaving only a blasted crater where it once stood . The Garmatron is massive and powerful , able to crush or push aside anything in its path - despite this , it can also move fairly quickly for its size . Its armaments include movable spikes between its treads , and cylindrical turrets on either side of its hull that can fire regular energy blasts or Dark Matter rounds . Its primary weapon is the massive cannon on its front , which can fire projectiles clear across the Endless Ocean . Its usual ammunition is a large missile with a Dark Matter warhead , allowing it to infect large portions of land with pure evil energy . The cockpit - located at the top of the machine - features a lever - activated trapdoor in the middle of the floor , allowing the pilot to drop enemies into a shaft which shoots them through a door , and out through the back of the Garmatron . Although the Garmatron has not displayed any structural weaknesses , its weaponry has a few exploitable flaws . Its side turrets can be commandeered by enemies ( as Kai did ) and turned against the Overlord ' s own forces , also its main cannon has a twenty - second warmup period before it can fire it ' s first shot , and its Dark Matter ammunition must be loaded manually into a port on its side .