Back when I posted this build, years ago, Harra set was a joke among the community for being one of the worst sets in the game.
Then it got buffed and buffed again, along with cold damage in general and is finally in a very good spot.
Here is a quick showcase of the build in 1.2.
Damage per stun jack
Performance:
Full SR 85 run. Can be challenging depending on the composition of the boss room.
Already killed Mogdrogen on that build 
Thanks for reading!
Had an idea on how to take down Ravager while making dinner, here it is!
You had the idea during dinner, or you killed Ravager during dinner? 
Added Crucible run. As expected, not amazing but it works.
Can I have a save file?
Sure but you’ll have to explain to me how to do that.
You put the char folder into a zip file
say character name is “ulvar” the folder name is “_ulvar”
Then you upload that zip file to here, click the “upload” icon and follow the instructions there
this is result _ulvar.zip (130 Bytes) and someone can download it and put char file in his/her game folder and play it
_Jackie Jack.zip (803.8 KB)
Like this?
yeah exactly 
Thanks, will check out once I get home!
Big buffs in 1.1.9.1, added a (sloppy) 2:43 Ravager kill video. Also uploaded a new version of the build since I finally got my hands on a Ring of Anubar.
Figured out that with the new built in sustain from Harra’s set, Bat constellation is no longer needed and adjusted grimtools accordingly.
Have you tried with the MI sword that would add additional 4% life steal on SJ?
Woah I missed that change. I have not tried it, nor do I know which weapon I would swap for it. Idk if the crit damage would make up for the loss of either proc. I don’t think I want to lose +1 all skills or 8% physical resistance though and I’m pretty sure I’d have to kite when Blast Shield is down regardless of how much adcth I can get.
And rolling that MI with decent cold affixes must be a nightmare 
took me 60+ runs for this stupid ring.
Really wanted to push the build to its limits, I recrafted almost everything for armor and physique. I was able to beat the timer for SR 85 (with pharma and lucky mutators). Fabius is hard but most other nemesis aren’t that bad if you’re careful. Also updated the screenshot.
Reviving this zombie thread with 1.2 update. Cleaned up the old irrelevant stuff. Build is pretty solid now.
I made a similar version of cold jack saboteur with slightly different items
Here is the link: it is very strong and can do SR90+ if you can avoid Moosilauke, the Chillwind which becomes a pain in higher SR and his high cold resistance
This version has high DA/OA, high physical resistance (44%), and very high hp regen from vindictive flame/pneumatic burst (about 3K which jumps to 5K regen with giant’s blood active, multiple circuit breakers in blast shield, giant’s blood, turtle shell, and divine light. The stun jack also heals thanks to harra’s set and they deal quite a lot of damage especially in close range. The black blood of yugol also provides 16% of enemy dmg reduction which helps.
This build also has massive RR (60% from dual chillflames and thermite mines, 35% from night’s chill, 23% from rumour, 28 from acid spray) and on top 20% reduced elemental resistance from viper devotion)
Total RR is 146%
Yea 2x new Chillflame is way better than this old setup I used. Cool build.