With careers such as 'rat catcher' (Initial equipment includes D10 rats on a stick.)
Dark and grimy world background.
Cludgy system held together with DuctTape that just about works if you squint at it. (Still true in the second edition, changes were minor - mainly refactoring a few D6s to D10s)
What's more to say?
"New players create characters believing themselves to be in for Dungeons and Dragons. Then the GM grins, and they realise they're actually playing Call of Cthulhu". A quote on the game from RPG.net. --Requiem Tsunami spent many hours happily hacking his way through dungeons using the WFRP system. --Tsunami CategoryGames