A Witcher carries two swords - but only wields one at a time, so the other hand is free to cast signs. Generally speaking, the silver blade is more effective against anything supernatural (werewolves, genies, vampires, ghosts, etc.) and the steel blade is more useful against mutants, humanoids and ordinary beasts. There are nominally three different fighting styles in the The Witcher; for developmental purposes, however, there are effectively six, as Talent points must be applied separately for steel and silver applications.