Level 97 CI Ice Nova of Frostbolts Hierophant^3.25

Notes

Featuring the following items from the TFT Mirror Shop:
Agony Salvation Vaal Regalia https://forbiddentrove.com/chests/
Agony Locket Simplex Amulet https://forbiddentrove.com/amulets/
Havoc Visage Hubris Circlet https://forbiddentrove.com/helmets/
+weapon

Alternative options: 
The original build came from Captainlance9 who used a defensively different version to farm Valdo maps taking all elemental damage as Fire, 
and using the necropolis chest mod "Fire resistance cannot be penetrated" (you can see Phoenix Pelt Vaal Regalia in TFT shop with this mod)
Using that setup usually needs Dawnbreaker, PoF Sublime Vision and Tempered by War (sacrifing 1 weapon, Clarity ES gain, and 2 jewel slots), or Shadowed rings or the new Watcher's Eye modifier
but I chose to use higher DPS and higher generic ES

You can push even more DPS if you drop Clarity and use a Wrath aura on an eternal blessing with a different Watcher's Eye with lightning penetration, lightning damage, and critical strike chance, 
so you can also swap Arcane Surge support for Awakened Controlled Destruction support in your main links and still proc Elemental Overload, or Hypothermia for Intensify if you can play with lower AoE

You can push more Physical hit pool with more Endurance Charges or more PTA from the original setup described above

You can push more Elemental hit pool by swapping 1 jewel suffix for +2% max resistance (+5% with adorned) legacy Melding of the Flesh, and using 15% magic flask effect on TWWT for +90% max resistances

You can swap to any spell that hits if you don't like the Ice nova visuals or the 2 button playstyle, for example Ball Lightning of Orbiting, or Spark (get proj tatoos, jewel implicits, faster proj support or a multilink glove),
because only 99% of the build's damage comes from Archmage and not the active skill. Area spells work the best because Hierophant naturally gives 100% increased AoE.

Mechanics overview:
Shock, Bleed, Corrupted Blood, Chill, and Curse immunity from jewel implicits
Freeze Immunity and Stun resistance from major pantheon Brine King

Recovery sources:
Regen from flask, consecrated ground from CWDT Purifying Flame, and minor pantheon Tahsin
AR & ES mastery 5% recovery when taking physical damage FOR EACH HIT is massive on huge ES pool, it stacks, it is comparable to %ES gain on block of block builds (Note that PoB doesn't calculate this at all)
Leech from jewel implicit

You CAN do NO REGEN maps if you swap in a Legacy Vessel of Vinktar or a Watcher's Eye with legacy "1.x% of Lightning Damage is Leeched as MANA while affected by Wrath" 
either with Eternal Blessing to maintain unreserved mana, or just with Enlighten to keep the Clarity ES if you can get a Watcher's eye with also that mod
With mana leech you don't even need reduced mana cost flask suffix any more