Bob was taken, so they had to find something else.
Ah but of course!
And he doesn't really like Susan, which is his middle name......
Well nobody likes to be called Susan.
Because these are actually a previously little-known branch of the Adeptus Custodes, and Sigmar is one of the Ninety-Nine Titles due to the Emperor of Mankind. The Shield and Hammer weaponry is used for incursions into the webway portal beneath the Golden Throne.
Right, on the same page now.