For high GR, the problem with EP builds is detonating the first EP to get the chain reaction started. That is evident in Inna EP builds as well as LoN EP. At high level GR’s even the trash mobs can have too much health to reliably detonate the EP and against a single target RG without adds you may as well quit the rift. Uliana builds get around that since the six piece bonus detonates the EP when the target is hit by SSS.
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