You will need Anubis-Vicious from stage 3. The boss has big combo attacks that do a lot of damage. First, give Crash the ninja outfit to outrun the freeze ray. Note: When he comes over, try to freeze him. Keep pressing Y to do the longest combo possible and take off a fifth of his health. He’ll use an orb to lift and hurt you. To avoid this, attack him while avoiding the orb. When at half health, he will make the drains cough up poisonous gases that hurt you. Avoid or freeze them. Keep attacking and avoiding damage and you’ll eventually beat him.