This build is a fun alternative to UE Multishot. It revolves around proccing the Natalya's 6 piece bonus and buffing up your sentry damage. Thanks to Zoey's Secret belt and Garwulf chest in the Cube, your survivability is also MUCH higher, in my opinion, than UE build. With optimal stats, I think you could push GR75+ easily with this build.
PLEASE NOTE: I am severely under geared for this build in the video. I just grabbed items I had in the stash just to test out the build and see how it functions. I'm missing a ton of dmg overall and some survivability. However, despite that, I was able to jump right into a GR65. I also could have finished it sooner if the maps were more open rather than so narrow.
In terms of the build, I used the exact skills in the guide, along with the gear. Well, I TRIED to get as close to the correct stats as possible, but as I mentioned, I am missing lots of stats, 40% cold dmg, etc., so I am much weaker with this build than I should be. Even then, the build was fun to play and as I mentioned a great alternative to playing UE Multishot.