Drop the Cloak of Garwulf and add the Marauders chest. It Will boost your sentries x400% etc.
even with all gear non-ancient and around 500 paragons, this build will do gr70. I had Trapped levelled up and the other gems at level 0 (zero) when I cleared gr70 as a reference.
Personally I farm rifts and low/medium grifts with UE and only push higher grifts for the last 10 levels with this build. It has good survivability and dps but movement speed and clear time is lacking (for me).
ps. I prefer the build description on icy veins for this build, but that’s just me...