I found this mob in the room above Percy, NW corner staring at some brew barrels (152, 441, 35)
Known to spawn on the bottom floor of the building west of the zone-in (in the same room as Percy Scrapfisher), /location 145, 395, -45. And also can be found in the room above Percy, NW corner staring at some brew barrels (152, 441, 35).
Also known to spawn in the same room as Falrorn Borlakio and Cleaner Bot (PH in this case is one of the mobs by the small yellow tables).
Hit for a max 10,746 on a max-shielding warrior.