You launch a ray of vile black flames to burn away at your foe's Constitution. You must succeed on a ranged touch attack with the ray to strike a target. On a successful attack, a living target is engulfed in chill black flames that feed on the fuel of their victim's life force. A creature engulfed in blackfire must make a successful Fortitude save each round that the spell is in effect or take 1d4 points of Constitution damage and become nauseated. A creature that makes its Fortitude save takes no damage for that round and is sickened instead. In addition to its effects on the subject, blackfire can spread rapidly. Each round on its turn, any living creature adjacent to a creature engulfed in blackfire must succeed on a Reflex save or become engulfed itself.