Unfortunately for him, there was a very opportunistic Azhag The Slaugtherer nearby! I surprise-DoW:d him and attacked his full stack + full Waagh with my two full stacks. This caused Grimgor to come north himself, to wipe out the dwarfs. I started noticing that the dwarfs were giving Grimgor some trouble, wiping a couple of his lesser armies. I had two full armies right north of Sylvania. My thought was to call a Waagh on Sylvania and take over their lands, but then I noticed that Grimgor had called a Waagh on Zhufbar => decided to observe the situation with some agents and not proceed with my Sylvania plan. I've been trying to avoid getting on his shit list for now, since more than likely he has enough to wipe me out. Grimgor is far and away #1, with about 50 settlements. They have Clan Angrud rolling around and two settlements around Zhufbar.
Meanwhile Grimgor has basically steamrolled everything in the southeastern map, wiped out Eshin and Mors, took over Karaz-A-Karak and other Dwarfs. Sylvania is at #4, trying to maintain peace with them thus far. Have two pretty good armies, strength rank 7. I'm playing Azhag, messing around the Empire, not being (yet) able to take over Altdorf. Man, the Norsca-style confederation and overall improvements to Greenskins make for some fun gameplay.