Super easy, if you have an ice breaker. Just sit back and kill them alone at a time. For phogoth himself, sit in the entry room and lay into him, when the shrieker appears run to the previous room and hide behind the door, it will disappear and take the wizards and knights with it shortly. Careful though, two shots from that shrieker will kill you
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Same strat but I would run out to the doorway lay out 2 Hungers and go back behind shrieker door before it spawns thus drawing Phogoth to the left where you can hit him with IB through a small sliver. Ads may block sliver so kill them, if Phogoth moved I'd run out 2 rockets and he'd line back up with the safe spot mentioned