Challenge completed. I am sure my Dervish would be able to go on, and in the future I might do that. For now I am going to theorycraft a bit for a classless approach.
EDIT: Classless challenge started.
If anyone has an idea on how to get a better devotion spread than this for classless (focused on healing, defense and retaliation with some way of dealing damage), please let me know 
Current setup has 1 spare point, which is in Scales.
Continued the True Passivist challenge after some radio silence. Build is almost ready for Elite though I dread the day I will have to balance resistances for Ultimate 
Been meaning to post, but laziness got me. Tried Passivist thru Elite. Finally gave up; missed bashing too much. Still, fun while it lasted and picked up some tips for playing a retal build (non-passive). Thanks for posting this.
As for classless: not even thinking about it.
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Itās definitely a grindā¦
Challenge is completed as a classless passivist 
I donāt know what is next. I feel like this is close to the edge of what is possible with this concept, but I guess I could try to complete the expansions in Ultimate as well, reach level 100 and complete all roguelike dungeonsā¦ The build is definitely too slow for Crucible or SR. The problem is: Anything with regeneration walls this build completely.
One thing I know for sure is that I am not going to try to one-up myself and do a Hardcore Classless Passivist 
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Any particular choice between Kymonās and the Order? Same for the 3 Witch Gods.
And yes, I did get an item with Thorns drop in Lower Crossing. 
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Nice find! Also, choice for Kymonās or Order, assuming you have already unlocked the faction belts, mainly boils down to which questline you prefer. Killing Bolvar (ranged attacker) or Noveria (caster) should not be very different, depending on how you deal damage apart from retaliation. Killing Ravok can be kind of tedious though with classless, so I usually side with the Order.
For the Witch Gods, I donāt think it matters but I usually go for Bysmiel.
I will do a new installment once the expansion drops
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Iāve started a run as well
Decided to go with Demo first as I figured that while the rest of the mastery wasnāt that great, Vindictive flame is the best skill, bar none for this kind of run (I think) It provides health regen (so getting whaled on is not that bad) and Ulzuinās wrath can take care of ranged attackers. Later on, it still offers Blast shield, and flame touched is also not bad.
Decided on Shaman as the second mastery, so I have an āattackā to attach RR devotions with Wind Devil. Slowly making my way to maxing Wind devil, Vindictive flame and the Pact of Mogdrogen line, along with a lot of health regen gear and devotions.
This is what it looks like right now: Elementalist, Level 34 (GD 1.2.1.2) - Grim Dawn Build Calculator
One little caveat: I sort of went a bit out of your guidelines: I wanted to try the run, but really didnāt feel like doing the grindy bit to level 6 to access my first skillā¦ That alone would turn me away from that challengeā¦ So I allowed myself to use the starting club until I had at least 1 point into Vindictive flame.
I hope that doesnāt invalidate the run for you
So far, this is pretty fun
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