Assassin's Creed (PC) - MB07 - The final battle - game guide, walkthrough, secrets, game tips & strategies

The first form

The old man will change into all bosses you met before. Kill them with counter attacks.

The second form

The second form is more dangerous. The old man will clone himself, but you can recognize the real one using eagle vision.

The third form

He got smarter now. When you hit him he disappears leaving you with one block of energy. Search the garden and when you spot him target him and throw a knife. Hit him with the sword. Rinse and repeat.

Ending

Go to your room and use eagle vision on the wall above the bed.