Total cost invested so far is about 6 divines. I started the league about a week late, so I've been catching up. I'll be releasing a full build video and another atlas build video in the upcoming weeks. The PoB below is not the final form of the build. I'll be utilizing a trigger cast weapon and a better shield, among other things.

PoB as of posting the video: https://pastebin.com/xGenfeAU (all boxes checked to view top-end theoretical damage, use configuration tab to uncheck or comment out // custom modifiers)

PoB you see in the video: https://pastebin.com/YnqaCLZF (I was testing things, don't copy this)

If you have any questions, feel free to comment on YouTube or here. I'll try to answer and be helpful.