You create a masterwork dagger out of ice. The dagger deals 1 point of cold damage in addition to normal dagger damage. If the dagger leaves your hand for more than 1 round, it melts and the spell ends. At 6th level, the dagger functions as a +1 frost dagger. At 11th level, it gains the returning property when thrown, melting away and reforming in your hand just before your next turn.