Glory of the Cataclysm Hero. All but two to be exact: I Hate that Song and Umbrage for Umbriss.
In September I went back to Halls with Rim on a whim and surprised myself by knocking out the first of the two, but it wasn't until today that I finally sat down and flew over to Grim Batol for the last one. I probably could have done them last expansion or at least much sooner on another character, but I wanted to finish like I'd started. So it had to be Rim.