1 to do normal attack and 2 to do special attack. Don't die and save Gobo! The lore is Gobo got taken over by the shadows and you (the character) have to stop Shadow Gobo (Thats the lore I guess) Can you really lose? I don't know.
The boss enters phase 2 at 500 hp Boss Attacks: 1. Laser 2. Dark Ball 3. Laser Beam (Phase 2 only) They can also combine attacks. You can to. I won't fix it.