Few days ago I met a Grievous geared Unholy DK when I multiboxed my 4 Shamis and for some weird reason his dots were hitting extremly hard. I was able to kill him in a couple of seconds with my 4 shamis but he managed to spread his disease and all my chars lost like 50% of their health just from the ticking disease.
No idea what this Dk does different than other Dks but his dots hit harder than of a affli lock.

