Off-Topic: 
How is it?
Didnt know there is an Campaing Setting for the Black Company...
There was only one book put out and it's a D20 system (nothing real fancy). They tried to include a little bit of just about everything from the books in it.  The magic system is a little bit different from stock d20, allowing you to shape and create your own magic.  It's pretty interesting, but a little bit different to work with from ordinary DnD.