[maka]

We had slayer weapons on an old versions of XUO (which did exactly that, extra damage vs some monster types, normal vs players), but they got removed cause they were not very sphereish. Doing it like scarecrow said would not lessen the sphere feel, and still give people some very interesting weapons.

Personally I like the idea of rare weapons and recipes, and you had this on IN. Hopefully similar weapons will be implemented soon.