As you walk you'll see him. If the top of his head is on fire and his Sceptor in his hand is glowing then he's invincible and will shoot fire-balls like the ones from the Dragonfly in levels 4 and 5 but these WILL hurt you. Use the water from the pipes to drench the fire and fire-blazing Sceptor. Once they're out he vulnerable so kick him and according to players Ball-smashing will do more damage. Repeat until health bar is depleted. Once he's defeated, Peace in Bugdom is restored but for good?