Pasting this build since people requested to check couple of videos of how build's single target works:

https://pastebin.com/veY8Tx4p

The shield surrender is not really needed. Rest of gear is extremely cheap and self crafted.

Pit of chimera showcase: https://streamable.com/4w0dv

Kosis in simulacrum: https://streamable.com/hxttr

Wave 20 deathless: https://streamable.com/6vpsw

https://imgur.com/a/8WSsnu7

https://imgur.com/a/60BSesQ