TL;DR - I think you can become very tanky as a living punching bag but have no idea how you would actually finish a map sometime before the league ends.

There is a new stun mastery that reads

Gain Adrenaline when Stunned, for 2 seconds per 100ms of stun duration

Using Valyrium or the Stun Threshold ES mastery, you can essentially turn every other hit into a stun if you keep your pool of es tiny and don't leech any.

Now of course standing still and tanking hits in this game is absolute suicide, but because you will be gaining adrenaline on every hit you can use First to Strike, Last to Fall on the champion ascendancy to regenerate 25% of your life instantly and remove all ailments whenever you're hit.

You can combine this with this with a stun notable, Unfaltering.

50% increased stun threshold

10% of damage taken from stunning hits is recovered as life

We don't care about the stun threshold because our ES will be empty most of the time anyways. Combining this with the newly released unique jewel, we can recover ~65% of damage taken from stunning hits.

Even if you aren't dying you want to be stunned for as little time as possible because the base timer of 350ms just feels kinda bad. Taking the new notable, Trial of the Faith, as well as the 80% increased recovery armor/evasion mastery, gets us to a stun duration of 130ms.

50% increased Stun and Block Recovery
Regenerate 5% of Energy Shield over 1 second when stunned
Regenerate 5% of Life over 1 second when stunned

The issue I'm running into is doing any damage at all while perma-stunned by white mobs. But after seeing the gem changes last night, the updates to Cast When Stunned Support caught my eye. the new cooldown lines up so well with stun duration that it feels intentional.

My current best idea is to use 4 CwS setups.

Two of them would be Voltaxic Burst, one would have a longer duration and is meant to stack casts in the queue while the other would have a shorter duration and be optimized for damage.

The third would use Lightning Warp so you will always teleport close enough to the enemy for Voltaxic Burst to actually hit. It doesn't have to be Lighting warp, I just really enjoy the skill.

The last setup would be utility, Molten Shell, A Curse (Conductivity/Despair/Punishment), and Hydrosphere.

However, I'm having a lot of trouble getting it to do any damage. By the nature of the mechanics bossing will probably be impossible, but I just know there is a competent mapper in here somewhere.

Here's the PoB for anyone interested in helping out.
https://pobb.in/ebGd2rIFMQxe

Update(4/6/2023)

I have been convinced to drop adrenaline altogether and it makes everything here make a lot more sense. I've swapped to an Inquisitor and I plan on incorporating a healthy amount of block. In my mind the end result is going to be similar to the Divine Shield + Aegis Aurora tech.

Cast When Stunned is absolutely not the best way to do damage here but the idea of being a living, teleporting, bomb is too great for me to pass up. Check the Updated PoB below.

https://pobb.in/ClhPc73J0VcI