"Cooperative or competitive Mordheim campaign where player warbands race against Skaven to capture some particularly valuable wyrdstone shards."
This campaign was created by Jim Weaver & his brother over at WargameWeaver around 2010. Their website is no longer active but can be visited here, however the campaign files themselves are no longer available but can be found below (zipped for your convenience).
Special thanks to Benjamin S. who dug up these files fairly recently in 2022, which had been missing for quite some time! He was also kind enough to remaster the campaign map! Always nice to see old material shine in the light of day again. You can download all the files below in a zipped format here.
WarpStones Map, Remastered (Scaled to A2) // Original Map