|casting time||1 action|
|duration||1 round/level or until expended|
|saving throw||wil neg|
The subject gains vulnerability 5 (fire). This means that, each time the subject suffers fire damage, the damage it suffers is increased by 5.
If the subject has resistance to fire damage, this may help overpower it. For instance, a fireball inflicting 18 damage on a creature with ER 20 (fire) will do no damage, but, with this spell, it would inflict 23 damage, which means the creature would suffer 3 points of damage.
The spell is expended when the subject has suffered one fire attack per level.