Just copy and paste my post from main forum plus some note
Dark buff and ice stance is a mechanic if player fail to lower his HP by xx% within 30 second he will use dark buff follow by ice stance 10 sec later
this mechanic reset after he’s used fire AOE
after dark buff if player can lower his hp down to xx% within 10 second he will skip ice stance.
Here is how mechanic work (for 100% hp to 80% hp after this is the same)
100 to 85 within 30sec
Fail = 10sec later dark buff and ice stance (some time he will use ice stance right away)
Success = skip ice stance
100 to 80 within 40 sec
Fail = dark buff
Success = skip dark buff
Fire AOE at 80% hp
mechanic reset after Fire AOE
Fire AOE at 80 60 40
when he’s enter his mechanic with a lot of Blade & Soul Gold moving he will immune to any damage and CC for a few second be careful if you use any CC or root skill that has long duration he will stand still in that place with immune to any damage until all that CC off (so do not use any CC when he has 81% 61% 41% hp).