PoE builds similar to Live 5 Ultimatum | Earthquake LowLife Champion

How the heck does this build work? He takes Instruments of Virtue, but what spells does he ever cast that aren’t instant? His resists aren’t capped but takes very little elemental damage and his effective physical life pool is in the hundreds of thousands. I don’t get it. Physical max hit he can take is 190,753 according to POB

I reached endgame for the first time in crucible, now I made my own build (pretty optimistic ik), it has a lot of stuff from a boneshatter build I used last league and would like to know what you guys think. Didn't bother including all the equipment because it's not clear yet but I'll be following the tree and using those skills. Also pretend trauma support is there, maybe vulnerability too?

The equipment is very starter-ish. No uniques, nothing required, just get some rare upgrades and go. Without dot-multis on gear it's still over 1mil dps with almost no gear. I've done this in like 30 minutes, but I think it could get better. Damage is insane (especially with ensnaring arrow on bosses [check "not moving" in config tab]). I'm sure it can be even taken to HC, if you can find some modifications to the skill tree. Probably max. resistances, Glorious Vanity. PoB here:

Posting my league starter, should be a viable build for doing all content in the game, i myself plan on starting this in SSF. don't mind the weapon it's just a place holder to simulating something i can get a day or 2 in. rest of gear is up to you playing.