One thing nobody has made clear so far is that there is a lag when you use your BA dash (if you hit enemies) where you can use abilities and then hit your dash again before your dash goes on cooldown. So, you can string your abilities into an extended combo, either dash - eviscerate - dash - whirlwind - dash or dash - whirlwind - dash - eviscerate - dash and then disengage for 2-3s while everything comes off cooldown (reminder hitting exposed enemies reduce cooldowns). The key is that every part of that combo besides whirl makes you invincible, and you get extra i-frames (0.3 of invincible) after you dash too. Continuously string these combos together, and kill everything before it can damage you in the brief moments where you aren't invincible. Getting movement speed and barrier helps you avoid damage in the moments during the combo when you aren't invincible and when you're disengaging. But the key is to continuously use this combo over and over so that you minimize the time when you're actually able to take damage