hes not too hard. Ive had several runs thorugh sm arm...ravager never popped up once, got bout 4 shoulders 3 helms 2 scarlet legs.  and i think thottbot's drop rate is off on the discription of herod. it says 16% or so when its 2.8% i believe. when i read 16% i had renewed hope :). only to be crushed :(.