You can transform your eldritch blast into a jet of high-velocity wind. This blast deals only half damage; however, a target struck by the galeforce blast is pushed 5 ft. + 1 ft./level away from you, and if the target is a creature, it must succeed on a Fortitude saving throw or be knocked prone. Targets of size Huge or larger are pushed only half this distance and make their saving throw with a +4 bonus for each size category above Large; an airborne target is treated as one size category smaller for this purpose. Attended objects can make a Reflex saving throw to negate the effect, and an object that is securely fixed in place may be unaffected at the DM's discretion.