In my opinion they don't really need to nerf the damage for NBs, as long as you can counter. I created a DK build specifically to counter NBs and what I've come to realise is that the problem is cloak. It's too cheap. I spend more resources (Radiant Magelight) trying to pull a NB out of cloak than being able to apply pressure on a NB. The fights go on and on until basically it comes down to sustain. NBs should not be able to sustain invisibility during a fight. Based on a NBs play style, if they can't make the kill off the get go, they should lose the fight. It's far too OP to be able to drop in and out of invisibility during combat.
My suggestion is to make Shadowy Disguise at least double the cost. You can make it last longer too if you like, that wouldn't be a problem and would allow PvE players to still find it useful... but any more than one or two times during a fight is far too OP.
... or it should work kind of similar to roll dodging, where it increases the cost if you use it too often.
...Radiant Magelight should also be cheaper.
My suggestion is to make Shadowy Disguise at least double the cost. You can make it last longer too if you like, that wouldn't be a problem and would allow PvE players to still find it useful... but any more than one or two times during a fight is far too OP.
... or it should work kind of similar to roll dodging, where it increases the cost if you use it too often.
...Radiant Magelight should also be cheaper.