I think it was just quad hits, but we used to stack damage shield on tank through various means and would top the DPS chart from it.I remember AOW hitting for like 8x1150 or so without defensive. He could one shot tanks until you were pretty decked out in shadows gear. He wasn't that difficult any more, but even into pop you'd still lose people on the tank transitions with how fast he hit.
Least that's how I remember it being when I tanked him.