Hemoplague problems

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Got a lv 80 summon necro. got all the way to act 3 terror and ran into the Hemoplauge and cant get past this fucking things. Theirs like 90 of them in a area so i cant run past them. Once my summons attack them they all open fire and melt my minions. Am i missing something? Have not had one problem this entire time until now. Advice? Info? anything