Eldritch Stream (3.5e Invocation)

Your eldritch blast becomes a continuous beam of energy. The line between you and the target you fired at is a stream of energy, and any creature which passes through this line takes your eldritchy blast damage with a Reflex save for half damage. In addition, if you continuously use your eldritch blast with this shape in consecutive rounds in a row, your damage rises by +20% each time (to a maximum of +100% additional damage after 6 rounds of constant fire). You can change your essence, but you cannot change your shape or do something besides firing your eldritch blast at least once a round.

On your turn you can sweep the beam. This is effectively a 60 ft 2-dimensional cone, but this is a full attack action. Creatures get a Reflex save for half. The continuous line area effect now exists at the new stopping point for your beam.