I'm going to go back through and do some updates after the Dec. 10th patch.
I don't think there will be anything "earth-shattering" done, since the build usually runs with less than full endurance and I don't usually run into trouble with init regen, I am hopeful it won't impact this too much...but we'll see.
I don't 'think' the change to what will become Infiltrator's Return, will be that big of an impact, but have to play using it to see for sure.
Fiery GS does not even have a Fire Field, so I wonder how your train of thought landed on it.
But yeah, Staff Fire #2 spam = profit.
Like I said...learning...I actually do not use Fiery GS, so was completely unfamiliar with its skills...I thought since Fiery Eruption creates, per its description, a pulsing Lava Font, that it would also create a field...but looking at the 2 together on the wiki, I see it does not show a "Combo Field" listed with that Fiery GS skill...which I find odd...so if it does not make a field, then Persisting Flames would not affect the duration of Fiery Eruption either...correct?
Just trying to figure out the synergies here...logically I think it should make a field, and it should be affected by Persisting Flames, but I can see how it might not, because people would start whining about it being OP...