A total of 48 additional skills can be crafted by combining two skillbooks of different types. Elemental skills can only be combined with non-elemental skills to create new skills. Any skillbook can be used as a component; however, if one of the skillbooks is a source skill — a skill that requires the consumption of source points — then the outcome will be a different skill that also uses source. Having both components be source skills will not produce a different result than when only one source skill is used. Keep in mind that crafted skills require points in both of its components' Combat Abilities.