I will have to call upon the hive mind once again to fill me in on the manufacturer of this figure, but my guess is that it is from Blood Rage or Black Plague. It is yet another example of how you can still get some fun results from those hard (or soft) plastic board game figures!
I think I have mentioned in previous posts how those two sided emery boards used by model railroad and kit builders are effective at removing most of the brutal mould lines on these figures. Everything else I have tried to use just tears away at the material, or cuts into it in the case of hobby knives.
So, don't be afraid to snag a few of those emery boards and invest a little extra effort into your board game pieces. After all, once you paint them and seal them... you have something virtually indestructible! :-)