Get ready for the cheapest boss in the game! The Bed of Chaos is a multi stage boss battle that is composed of three stages. First, once you fall of the slide into her arena, sprint to the orange shield on her right side and attack the core of it. Now, save and quit. Yes, I said save and quit. Reload your game and you'll be placed right outside the fog. Then once you fall, hug the edge of the wall and jump the gap and go for the core of the shield of her left side. Now, save and quit once more. Reload your game. Once you fall this time, go for the center. The ground will collapse underneath you and you'll need to roll onto the trunk below. I recommend baiting her into doing her sweep attack on that area of the arena and then the second she finishes the attack animation, sprint and roll down. Now simply fall the path to the center of the boss and attack. The bug at the core will die in one hit.
NOTE: The stages don't reset if you die or save and quit.