The fight is very similar to the one you have been in before, except his attacks are stronger and quicker now. Your strategy remains the same however, dodge his attacks and when you get the chance shatter the sphere and try to destroy his shield. Follow it with Devil Trigger and buster; rinse and repeat. When Savior gets red and starts to fly around the cave roll to the sides, dodging his attacks.
Well, that's the last fight. You need to dodge monster's blows and use buster in the right moment. Dodge the first attack by rolling to the side and immediately follow up with buster; when his other hand moves towards you use buster on it, and do the same when he lowers his head.