[Li-Ion]

I would recommend to summon the Knight Solaire at the stairs in front of the fog gate. He can take quite a beating and with a bit of luck one of them occupied while you take apart the other. In my opinion this fight is almost impossible without summon, divide and conquer is the key to win here. Also, I noticed they take more damage from fire-based weapons and attacks. I heard it's 'easier' to take out Ornstein first, but I did it with Smough first and didn't find the second stage of Ornstein to be more difficult than the second stage of Smough.