Killing GR Guardian

I’m running the Valor Set and I switched from Bane of the Trapped to Pain enhancer . The GR Guardian is much harder to kill is there something that needs to be stacked in order to kill him easier?

You want to stack a decent amount of Stricken stacks before using crowd control skills and proc Bracers of Fury effect. It’s important other players don’t apply these ones ‘cause the more you blind, immobilize and stun enemy, the more he become resistant, reducing the time of its weakness. Personally I like to start blinding RG when it’s 3/4 life left; therefore I synchronize Shield Glare with Holy CoE cycle to maximize my damage output. If Monk apply knockback to RG and proc SB, then it is even better: +30% damage, obviously in you Holy CoE cycle.
This playstyle is mandatory in high Tiers.