I fucking hate Vendrick. I'm not finding him any easier on my second playthrough with a different character. I'm fine until he does his sweeping combo. The first hit stunlocks and drains 100% of my stamina when blocked or clipped whilst rolling, which basically means I'm dead because even if he only does 2 hits and not 3, the next swing is guaranteed to hit and takes 80% of my health and then I'm left scrambling to heal.
Mantra: "Breath in, breath out... all it takes is patience. You've done it once, you can do it again!"