http://lineage.pmfun.com/list/quest/doombringer
I was on step 9 of that guide, where you go to the tablet and talk to it and the mob spawns. The mob did not spawn. There was also another character there that could not use the tablet for the same reason. As you can see in the screen shot below.
http://img140.imageshack.us/f/shot00000er.jpg/
Its fixed now