PoB: https://pobb.in/kJMk1Imw4Cla

I've been enjoying this build a lot and thought I'd share it. It's practically immortal (except for some uber mechanics and extremely juiced phys damage mobs), does ~20-30m dps (PoB doesn't calculate Flameblast of Celerity correctly I think), has +320% increased AoE, explosion chains and freeze.

I did all challenges on it, including 4 ubers (Exarch, Eater, Maven, Shaper).

The main offensive mechanic is abusing Ralakesh boots, Tulfall wand, Malachai's Loop shield and Inner Conviction from a Dominus Timeless jewel. Ralakesh's boots lets you always be considered as at max power charges (9 here) and gives you all the benefits. This circumvents the downsides of Tulfall and Malachai's loop because you don't lose the power charges. It also lets you benefit from frenzy charges despite having the Inner Conviction Keystone allocated, which prevents you from gaining frenzy charges.

I'm using 4x "4% increased aoe per power charge" on charms/that which was taken, as well as awakened inc aoe. If you wanted to push the damage higher you could easily do it by swapping inc aoe to conc effect and the AoE charms to 5% crit multi per power charge.

My rares are fairly garbage. They could be much better but I just wanted something workable at the start and never went back to make them good.

Some notes on "hidden" mechanics:

• I get ailment immunity from my timeless jewel
• I use the timeless jewel, inspiration, and a flask craft to have 98% reduced mana cost, this lets me use a blessing and channel my flameblast while reserving practically my entire mana. You need to be careful not to go to 100% reduced mana cost, because this prevents you from gaining inspiration charges.
• I get 60% crit reduction from Sanctum of Thought and the Crit Mastery to counter the crit damage boost from blue wisps.
• Flameblast of Celerity automatically releases at max stacks, unlike the other Flameblasts.
• Defiance of Destiny makes you immune to all hits that deal less than 40% of your unreserved max HP and causes smaller hits to heal you. Coupled with Petrified blood you're effectively immune to everything that doesn't deal 67% of your max HP in a single hit.
• Explosions are from Oriath's End + Herald of Ash

Disclaimer: I got a Mageblood from a puzzle box and rerolled into this. I have not played the build without a MB. MB helps fix the main issue of the build - tankiness. Channeling builds REALLY need to be immortal to have fun in my opinion. If you don't have a MB you'll probably need to get some more elemental mitigation, maybe all resist stacking or spell suppression. Or you can just be okay with dying occasionally.