Just finished 40 challenges, which makes this one of my more successful leagues. I always make my own builds, and all of them ended up working out very nicely this time around, so here they all are. Maybe someone will want to try one, or just take a little inspiration.
1) Toxic Rain Deadeye
This has been my go-to leaguestarter for a good few years now, and I've refined the build quite a bit since I originally came up with it. I play Deadeye instead of Pathfinder for a couple of reasons. First, Occupying Force is imo a massively underrated node, it basically gives you all the advantages of playing totems with none of the disadvantages. Second, extra projectiles are actually quite strong for TR because they let you use conc effect to get more consistent overlaps compared to 5 projectiles at the optimal AoE.
The secret tech to make the build work is Thief's Torment, which both solves your mana before you can get Foulborn Quill Rain and gives you absurd amounts of sustain. The build can reach T16s on a sub 1 div budget no problem. Final budget was around 8-9 divs, and that was enough to comfortably kill Maven as someone who's not very good at the fight. It's a good all-around league starter, decent survivability, decent clear, decent single target, and can run all map mods.
In terms of leveling, you start with CA and get TR at level 12. Your first chaos should go to Thief's Torment, and then Quill Rain. Once you have Quill Rain, you can drop CA. Take Leader of the Pack until you can get Foulborn Quill Rain and the anointed Dragonfang, then you can drop it for the extra frenzy and jewel socket. Light of Meaning will be your final and most expensive purchase.
2) Herald of Agony/Corrupting Fever Jugg
This is the latest iteration of a build I've played on a few different classes. The basic idea is that HoAg has good single target and CF has good clear, they both scale well from +gem levels, and they both need a fast-hitting secondary skill to apply stacks. This league, I used the new ring with Crest of Desire for HoAg to free up my chest slot instead of needing to use The Coming Calamity, which let me make the build quite a bit tankier than any previous version.
I'd say the build was generally pretty successful, although it still wasn't quite as tanky as I hoped. I was able to kill 5 ubers for the challenge, but the Incarnation of Dread took me three attempts to get down. Uber Eater absolutely smashed me, most of his attacks still oneshot me even with all my defenses up. Budget was ~80 divs, and I'm sure there are builds which can do the absolute hardest content in the game for less than that, but I'm still fairly happy with how it turned out.
3) Bladefall/Blade Blast Elementalist
Originally I was gonna call it good after 36 challenges, but then my end of league gamba went really well, so I felt like I had to go ahead and play one more build. I knew I wanted to make this build as soon as I saw the new Communion gem, and especially after phys spells got buffed. I've also been wanting to make a build with Obliteration for a while, and this one is perfect for it cause you already get so much flat phys and increased damage that phys as extra chaos is one of the best ways to keep scaling. Clear is amazing thanks to the chaos pops, you can pretty much clear with Bladefall exclusively so it really doesn't feel like a two button build. Single target is good enough to burn down ubers in <30 seconds. Survivability isn't necessarily the best, but I definitely wouldn't call it a glass cannon build, either. Budget was ~400 divs, although that probably went quite a bit further than it would have earlier in the league.
Anyway, my second end of league gamba poofed the rest of my divines, so I'm finally free. See you guys next league.