Kharn has passive 1-B Power Null and works by what Khorne considers unfair, to him anything that isnt close quarters brawling is unfair and nulled.
Even to the point where someone was BFRd when they where Kiting Kharn.
"Kiting refers to keeping an enemy chasing you while also keeping it at a range where it cannot attack you. This tactic is often used to more safely attack the enemy using a long-range attack or to distract the enemy while others attack it."
Because he can nullify anything, seems NFL to me. I said seems not was btw.
Was it like Accelerator's vector Manipulation?
Esper abilites work differently than what you see in most fiction because it all comes from calculations rather than the power just being there. So one would have to be able to either nullify them being able to calculate or be able to nullify AIM.
Accelerator understanding an attack doesn't care about AP, so the 1-B or higher don't matter in this regard. It's the mechanics behind the attack that matter and if he can understand the mechanics.
Basically if he can understand the mechanics, then it's not getting through no matter what.
If he can't understand the mechanics, then it only needs to have 9-B tier and it could possibly kill him. In base that is.