[Sombre]

The reasoning is that they don't like travelling away from Skavenblight and they don't trust any non council skaven.

It seems they aren't a very popular unit, though in the current version they do have exceptional morale, considering they're Skaven. They may well be improved in a later update (There are several still to come as I have to do all the Skaven heroes, add a pox cauldron and give the screaming bell and doomwhell proper graphics).