Let it be known that in the new End Times book we learn of the sad fates of King Belegar and Thorgrim Grudgebearer, killed during battle with the Skaven Queek Headtaker, and the collapsing of Karak Eight Peaks to keep its treasures from the filthy hordes.
I hereby declare a grudge against those damnable Skaven for committing so foul a deed.
(Or alternatively a grudge against the 'lore writers' for the even fouler deed of coming up with this End Times thing in the first place.)