Because I have potato gameplay I decided to make a build that can facetank as many boss mechanics as possible.
Anyone still looking to easily take down ubers for their challenges can easily replicate the items for this build.
Defensive layer is basically tempered by war keystone plus exarch shield to convert most dmg to fire and running an 85 inc effect ruby flask with permanent uptime.
I use explosive trap because its the most dps for lowest investment but you can use pretty much any skill you want.
PoB: https://pastebin.com/K1umCYHx
I swap to +3 max res shield just for uber exarch since he only does fire damage.
Other uber boss kill vods can be found on my channel if you are interested.