You form a scimitar our of the water vapors in the air.  The scimitar counts as a magic weapon, uses a melee spell attack, and deals a straight 1d6 cold damage and 1d6 slashing damage (no extra modifiers to the damage, unless from a spell at a higher level than this one is cast at or a magic item that is not Common).  You can give the scimitar to someone else, in which case it uses their ability modifiers, but your spellcasting ability score. 

At Higher Levels.  The spell creates two scimitars at second level, three at third, and so on.