Dracula is the final boss and has multiple forms, each more challenging than the last. You must defeat all three phases to complete the game.
Phase 1: Human Form
Dracula teleports around the room, firing three fireballs in a spread pattern. He is vulnerable when he materializes. The Holy Water is incredibly effective here, as you can throw it where he's about to appear, dealing continuous damage. The Cross also works well. If you have Sypha, her Fire spell can quickly deplete his health. Focus on dodging his fireballs and getting in hits whenever possible. He has a relatively small health pool in this form.
Phase 2: Bat Form
After defeating his human form, Dracula transforms into a giant bat. He flies around the room, occasionally swooping down to attack. He also drops fireballs from above. His head is the weak point. This form is more challenging due to his erratic movement. The Axe sub-weapon can be useful for hitting his head when he's high up. The Cross can also hit him multiple times. If you have Sypha, her Ice spell can freeze him momentarily, allowing for free hits. With Alucard, you can transform into a bat and fly to hit him. Stay on the ground and jump to hit his head, dodging his swoops and fireballs.
Phase 3: Demon Form
This is Dracula's most powerful form. He is a massive demon that fills a large portion of the screen. He attacks with powerful fire breath and summons smaller enemies (often Flea Men or Zombies) from his mouth. His head is the weak point. This phase is a true test of endurance and skill. The Holy Water is again very effective if you can land it on his head. The Cross can also deal consistent damage. If you have Sypha, her Lightning spell can devastate him. With Grant, you can climb the walls and attack his head from above. With Alucard, you can use his bat form to fly up and hit his head. Prioritize dodging his fire breath and the summoned enemies. This battle is long and requires perfect execution. Good luck, Belmont!