The Knight Conqueror has a infinite combo of a shield bash followed by a heavy attack that is nigh unstoppable. If one fails to dodge the initial shield bash, it stuns you long enough that the following heavy attack cannot be blocked,.dodged, or parried, and recoil caused by the heavy attack then makes it impossible to dodge the NEXT shield bash and so it goes on and on until you die.
My suggestion is to just reduce the stun/recoil caused by these attacks on the Knight Conqueror specifically.