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Sorry for the long delay. A lot of stress(from both the video and work) caused it.

So here we are with the battle against Fawful(finally!) and his new powers. His helmet will pretty much prevent you from dealing any major damage to him, so just stick with punches and fire breath until it finally detaches from his head. Inhale it, and let the Bros deal with it. If you're fast and strong enough, you can kill the helmet before it leaves Bowser's body. More on that later. While dealing with Fawful, pay attention to his attacks, specifically the star beam and his portal/dark energy things. Watch the star you have to punch, and watch what portal links to the ones near Bowser.

As for the Helmet, it'll start off by sucking up one of your blocks, and then using one Bro as a weapon against the other. Jump on it to stop the attack, then hit it once again to get the block back. His other attack consists of shooting orbs at the Bros, but fortunately they're color coded so you can at least tell who it's aimed at. Once you're set, attack the helmet with your strongest attacks. If you're good, you can take this thing down before it leaves Bowser's body