For those who haven't yet to obtain a THORN. You can easily solo the Summoning part of the bounty! When you get to phogoths front door knock twice until the door opens, run inside uninvited and make a huge clockwise loop to get all the enemies to register then come back to the front door and snipe out all the knights in your way. When you clear out all the knights, brake in to the house again making another clockwise loop and kill all the acolytes and wizards and needless to say annoying thralls. Shoot rockets, fusions and throw grenades to take down Phogoths health and when he gets to a certain point of his health he will call 911 and ship will come. Repeat process until the 3rd ship come then invite Xyor the Unwed to a date and spice her drink to poison her to death! :)