Lifedrain Blast (3.5e Invocation)

The art of Lifedrain was brought by a nameless abyssal monster to a group of warlocks; with time, the art spread, causing intense harm on the material plane.

Your abyssal blast deals vile damage; additionally, you heal half the damage you inflict with your abyssal blast or up to the creature's current hit points, whichever is lower. Creatures slain by your abyssal blast crumble into bone and dust upon being slain.

Additionally, if Lifedrain Blast is used with a proximity blast, the creature struck by the blast must make a fortitude save or be dazed for 1 round. You may also use the proximity blast as a full-round action; if you do, and the creature is slain by the blast, you are rejuvenated to young adult age for 1 month per CR of the slain creature. Vermin and animals do not provide any rejuvenation when lifedrained.