Great guide thank you!
I'm just wondering two things:
Is permachill worth it? Am I better off investing those points in Enduring Winter instead so my spells cost less and I can keep molten armour up longer? MA helps me get at 23% crit and 33% in raids (shattercap).
And; I'm not understanding the arguments against Ice Shards?? To me the ice lance range buff more than anything seems a necessity and the slow on blizzard is a bonus.
Additionally, what is the argument for 2 points in netherwind presence versus firepower?
I believe you are referring to permafrost, and no for PvE it is not. Your water elemental barely takes AoE damage, so it will virtually never die unless you do as well.
As Lhivera has pointed out, the uptime gained in Molten Armor from Enduring Winter is actually quite small, and the points are better spent into Ice Shards.
Actually the reason for Ice Shards is mainly because just putting it up once gives blizzard the chill effect. This chill effect when used on multiple enemies usually maxes out your charges of FoF and gives you a BF one. This makes for a very quick and easy transition to single target damage. It is worth noting however that the 25% slow does virtually nothing (tested on cho'gall multiple times) due to how the slow is applied and of course the limited radius of the spell. The slow is only notable in 2/2, where it can actually make a big difference in fights like cho'gall if you lack ranged that can AoE CC efficiently.
I'm not sure about the whole firepower thing. Technically it should increase the damage of FFB, but i don't think that it'll cause FFO to explode because as of the hotfix, it is a different spell now.
Although, once the t12 4 piece is achieved, Firepower might be a better option than Netherwind presence, due to the fact that it will become a much bigger part of our overall damage.