Greater Invocation; 6th; Eldritch Essence
This eldritch essence invocation allows you to change your eldritch blast into a repelling blast. Any Medium or smaller creature struck by a repelling blast must make a Reflex save or be hurled 1d6×5 feet (1d6 squares) directly away from you and knocked prone by the energy of the attack.
If the creature strikes a solid object, it stops prematurely, taking 1d6 points of damage per 10 feet hurled, and it is still knocked prone.
Movement from this blast does not provoke attacks of opportunity.
Source: Complete Arcane