My group and I are also starting a campaign that is attempting to blend Grim Tales with the Black Company. Really, we want just GT with the BC magic system. It seems like such a combination would fit the campaign world rather well. Would you (Tormenet) mind detailing some of the conversions that you have done in this regards?
What we did (are doing):
1. We took all of the magic skills and feats wholesale.
2. We took each of the magical magnitudes and made it them a Talent Tree (Smart, Dedicated, or Charismatic).
3. We make a Talent that allows the selection of the Talent feat (from BC). We're not sure this is the best way to do it, but it seemed somewhat analogous to the D&D thief being allowed to take a feat as one of his special abilities.
4. We are struggling with the definition of Caster Level. In BC is it 10 + Ability + 1/2 of your Wizard level. Since there are no Wizard levels or even class level that have to be "magical" levels, we are looking for something else to replace the wizard levels. Perhaps the number of "magical" talents? Since those are gained (roughly) every other level they would seem to work out, but that penalizes a player that doesn't focus on Talents.
Any ideas, corrections, questions, or statements of awe at our stupidity would be greatly appreciated (well maybe not that last one).
Thanks.