This is a lot like my build I am using for my first playthrough which is also a hardcore character.
I am finding it very easy to play, I was worried about no circuit breaker but Im level 33 and already have 5.7k Hp.
I have leveled up like so;
I used Devouring swarm exclusively for my damage early, getting Mogdrogen’s pact to 6 and then pumping points into the mastery, I decided to forgo any early points in Occulist as I saw it needing to many points to bear any real fruit. My thinking was Devouring + Storm totem/Corrupt storm with Wendigo/Blood Pack would trump Devouring + Curse of frailty/vulnerability and if I invested that far I would be mad not to go that little bit further for Blood of Dreeg.
With that plan i was able to get to 40 Shaman mastery and points into Corrupt totem at 25 and by 28 my build was was looking like this…
I am currently 33 and going great, I did have some early spirit problems with gear but they were easily fixed and might have a few more issues in the next few levels. I restarted my character (previous character to this one) after I found out through testing I can use the crucible to get early devotion points and basically max my points after a single normal playthrough (currently have 19 points and yet to start my veteran playthrough). I am clearing up to wave 80 easily and now just repeating that over and over (doing early waves because its fun haha).
I am pumping points into Occulist to give me the stats I need only stopping to get 6 points into Blood of Dreeg and then going all the way to 50 mastery and plan to invest into Possession then most likely Curse of frailty back at the start. I’ve simply been balancing my Devouring swarm points based on how much mana I’m chewing through currently I have it at 12/16 and doing great as max I was waiting for my mana pots to come off CD in big waves.
For devotion I want to hit Dying god quickly but due to the amount of points needed I first invested in Bat, Lizard, Gallows and currently putting points into Wendigo… considering once I tackle normal at level 40ish with 22 to 24 devotion points from doing the crucible Ill just move over to dying god while doing that run.
Hope this helps anyone who might be a bit stuck with how to tackle it, I was a bit worried I would do something wrong but this has worked out fantastic thus far. If I happen to die I can almost say with certainty that it will be because I got careless and not due to the build.
Edit: I will add wave 35 in the crucible (I think its waves 30 to 40 anyway) there are two champ parasites that spawn a poison one and a blood one… THEY SUCK SO HARD! Its not that they are dangerous (they can get you down but I always had a health potion on cd) but they must be almost immune to vit damage, even with my totems they take a minute, my first kill without the storm totem took 5 minutes I reckon lol, because this build is so tanky it was like the unstoppable force vs the immovable object.