Lash of the Astradaemon

You draw on the essence of astradaemons to cause one of your hands to elongate and sprout fearsome translucent claws that radiate a cold phosphorescence. You gain one claw attack, which is a primary natural attack that deals 1d6 points of slashing damage on a hit (1d4 for a Small spellcaster) and forces the creature struck to succeed at a Fortitude save against the spell (spell resistance applies) to resist gaining 1 negative level. Each time you inflict a negative level with this spell, you gain 5 temporary hit points that persist for 1 hour. A creature that succeeds at the saving throw against your claw’s negative level is immune to further negative levels inflicted from this casting of lash of the astradaemon but not to the claw’s damage. The claw does not interfere with your ability to cast spells or perform other actions that require hands. You can use your claw attack up to 1 time per 2 caster levels. Your claw reverts to a normal hand once you’ve delivered all of your potential attacks or after 24 hours (whichever comes first).