Root Abyss Boss Mechanics

I believe it's been said stuff like kaiser's link skill and other forms of boosting your HP like that will tell the game you're at like "105% hp" and then the game will only take off 100% of your total hp, allowing you to live.

As far as lag from pierre fire, vellum fire, poison, etc that sounds like common graphics card problems. I've had/have other computers with not so good cards and anything with fire/poison/mist will lag the computer up, especially mist effects. Only way I know how to fix it is to either get a better card or mod the game to disable said effects (or have nexon allow an option that would remove said effects but don't hold your breath).

I have 7485 hp without any hp buffs (which is usually how I Root Abyss) and I do have a random +3% all stat on one of my rings. I don't have the Kaiser's Link skill. But is there any reason Von Bon's "ohko" is different from, say, the Queen's? Her breath kills me just fine. Perhaps Shinku is right about needing a certain amount of hp before you're safe from ohkos.