This is my league start build so I'm happy that it's playable. This build can kill Uber Boss, it can't facetank them however.

Pob: https://pobb.in/DsU2DCj8uDqi

Build cost: 2 Forbidden Focal Point Jewel - 140 div (fix single target damage which is our main weakness); Belt - 35 div; Everything else ~ 30 - 50 div.

You can use Olesya Belt and Ralakesh Boot + Frenzy Charge stacking to fix single target without the Forbidden jewel but it wont be as tanky as using rare micro belt. I use those + Eternal Damnation amulet to comfortably farm maps before I have enough div to buy Focal Point Jewel. (Viper Strike Mamba not attack rapidly so it kinda hard to sustain affliction charge during boss tho).