Boiling Blood(Complete Mage, p. 97)
Level: Sorcerer 2, Wizard 2, Spellthief 2,
Components: V, S,
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Target: One living creature
Duration: 1 round + 1 round/3 levels
Saving Throw: Fortitude partial
Spell Resistance: Yes
Your target's skin begins to redden as his blood starts to boil within his veins.
The subject of the spell suffers as his blood heats up, taking 2d6 points of fire damage. For every three caster levels, the spell lasts an additional round (up to a maximum of 7 rounds at 18th level), dealing another 2d6 points of damage each round. A successful Fortitude save reduces the duration of the spell to 1 round.
If you cast boiling blood on the same subject before the first casting has expired, the second spell has a different effect. In any round in which the subject takes damage from the spell, he is also sickened. This extra effect lasts for as long as the duration of both spells continues, after which only the normal effect occurs for the rest of the duration of the latter spell.
Creatures immune to extra damage from critical hits are immune to this spell, as are creatures that lack blood or similar internal fluids.