The Bull Clones used an Iron Bull Tank to prevent MK's team from entering the Flaming Foundry.
LEGO® Building Instructions' description
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Emergency! Bull ClonesGrunt and Roar are launching an attack in their powerful Iron Bull Tank. Team up with Monkie Kid and big Sandy to defend Megapolis. Dodge shots from the tank’s six-stud rapid shooter. And watch out for rolling oil barrels! Launch a counterattack using Monkie Kid’s Golden Staff and Sandy’s Crescent Staff. You must be brave and show all your creativity to win this battle!