So how do you fight high level stygian Zino?

I don't understand how you're supposed to fight him. He's kind of like a worse Brute Tigrex.

The first half of the fight is doable, but when it gets angry, there's literally non stop attacks. Either it's flinging around, or either the red lightning is coming from seemingly nowhere.

8* I can handle, but anything above that is practically a potion pit. I can't stagger or break its parts, and the weak points are gone (?) after the scream?

Whats the best weapon to handle all that barrage?