Then you haven't found it yet would be my guess. It's an optional area that's a bit tricky to get to.
And I never had the trouble dodging attacks in DS3 like I do in this game. There's a small delay on it. I don't know if it's just a console thing or in all versions. The best way I can describe it is in DS3 I hit the roll button and roll. And in ER I hit the roll button and then I roll.