Saga of Blood Quest Last Step "reign in blood"

Anyone happen to notice what the last step in the quest involves? I figure the next 3 steps are the same, kill 5 people, reach level 60/70/80 etc. But the “reign in blood” that one is not clear. For those who got the magic level 80 bug a few weeks ago, anyone recall what it was?

I think its has been stated before you need to kill a certain number of ppl in arena. Which also fits the reward you get.

hopefully that wont be the case as that will just be a alt farm fest.