Your first true encounter with Antasma occurs relatively early in the game. This battle serves as an introduction to more complex boss mechanics. Antasma has several distinct attacks:

- Bat Swarm: Antasma sends a swarm of bats. Mario and Luigi must jump over them. The number of bats indicates which brother they're targeting.
- Dream Orb: He creates a dark orb that floats towards one brother. Use the hammer to hit it back. Timing is key to send it back effectively.
- Pillar Summon: Antasma summons dark pillars. He will then charge at one brother, who must jump over the pillars.
Weakness: Antasma is generally weak to jump attacks. Bros. Attacks like '3D Red Shell' or 'Luiginary Stack' (if available) are effective. Focus on dealing consistent damage while learning his patterns. He has no specific elemental weakness at this stage. Keep your HP above 50% as his attacks can be surprisingly strong for an early boss. Reward: Experience and a significant step forward in the story.