For grouping generally keep your heal over time, screaming terror mez spell (if you have it yet), and for here your undead charm/nuke memmed. Charmed pets are massive dps compared to your 24 pet
[You must be logged in to view images. Log in or Register.] Just don't charm any high level mobs (standard ghouls probably ok but they might root you when charm breaks
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If you're looking for an alternative consider the WW giant fort
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