I spent the last three weeks on Argo playing my uberpletionist Warlock with 145 reaper points without Dragon Breath to get a feel for the U66 changes. I opted for a more “controlling” version by shifting from T5 Draconic with Greater Ruin to T5 Magus with Burst of Glacial Wrath and Intensify, and utilizing LGS Salt in the offhand. Changing to Magus also prompted shifting my pact from GOO (acid) to Carceri (cold) for obvious reasons. I also shifted my class enhancements to ditch Feydark Illusionist, instead picking up helpless damage in Falconry and Crush Weakness to make up for the damage loss with ditching Ruin and the synergy with BoGW. Overall it’s been a miserable experience due to the mobs with cold immunity in the game (something I rarely encountered with acid).
For example, I was solo farming Legendary R1 Make Believe items for an alt, and the end fight was a complete slog on a character with the absolute best gear in the game you can possibly have because hags are cold immune. Ice Comet and Moon Lance were absolute losers in that situation. Talk about a feels bad situation. And with ditching Ruin, all I had left was the force damage from my Eldritch Blast, the negative aura pulse from the Magus mantle and the pathetic damage from Consume. It was so frustrating that I opted to farm on a melee instead. Don’t get me started on the number of skeletons in the game, which are also cold immune. While heroic leveling, I just grit my teeth and suffered through the cold immune mobs (Delera’s absolutely sucked to get through).
In R10 groups, I was basically relegated to locking down packs of mobs with BoGW, Mass Hold and Evard’s and hitting Time Stop for the endboss for melee to obliterate. It lacked the thrill of blowing up a pack of mobs with a crit Dragon Breath like I used to do.
Without cold immunity bypass, going T5 Magus + Carceri is a huge disappointment. I love the Warlock play style, but Carceri is simply too frustrating without a way to strip cold immunity. But with Dragon Breath damage getting double nerfed between the MCL30->20 and 50% reduction in damage scaling, justifying T5 Draconic Incarnation for Greater Ruin is no longer compelling. Warlock was already disadvantaged from a gearing perspective due to the need to gear for both an element and force spellpower, crit chance and crit damage. And I was lucky enough to win the lottery with a GOMF double set bonus of Shaman’s Fury and Biting Sands to maximize both. If I continue as a nuker in U66, which is highly unlikely, it won’t be as a Warlock.
The nuker meta already favored cold due to the extra crit chance and spellpower from Frozen Wanderer. Sorcs, Druids and Alchemists (all of which autostrip elemental immunity) will continue to use cold and barring disruptive changes in Primal Avatar that haven't been revealed the ED nuker meta firmly shifts to T5 Magus. Every group and raid benefits from Time Stop (assuming it doesn’t “miss” which it is prone to do), and with the overall meta favoring melee it’s quite effective for optimal team performance. Nukers will make up some of the personal damage lost from the DB nerf by pivoting to more helpless damage by incorporating Falconry, Crush Weakness and the Cruel Cut set bonus. Gnome/Deep Gnome Alchemists will come out on top of the nuker meta, having racial access to Greater Color Spray on top of BoGW and their helpless-inducing admixtures. That assumes lag doesn’t keep their reactions from spiking, which has been a frustrating problem to endure. Sorcs will favor instakilling due to their cooldown reduction and acting as a temporary quasi-tank, utilizing T5 Falconry.