Make a boss easier
Which bosses in act 6-7 do you think could be made easier by adding 1 extra node. (No poison/bleed vulnerability type node, try to think of something else)
I'd personally add to a 6.3.6 a power reserve node, so that you can keep him permanently stunned (with characters like Stark Spidy, Ronan, Thor...) and actually have counters other than Ghost.