U can do this alone, but def more fun with others. Clansmates wife did it alone, thats one badass woman. She did it by getting to phogoth, dropping his health bar to a 3rd n waiting for the wizards to come to the doorway to phogoth. Watch that shrieker tho. I just completed this laast night. Such a cool wrinkle to the phogoth mission, remember nobody kill phogoth n u get xyor on the 3rd drop ship. Its magical really when u can taste thorn being yours at thaat point.