Hot Head is the boss of the last major dungeon, Turtle Rock.
He’s basically a big piece of molten lava. And he can easily hurt you if you’re not careful.
But I had fun destroying him with the magic rod.
And he too gives a final warning about the Wind Fish waking up and vanishing the whole island as it’s all a dream.
You get your final full heart container after he’s defeated.
And the last instrument to wake up the Wind Fish, the Thunder Drum.