Beltyn's Burning Blood

The taste of copper fills your mouth and bloody splatters punctuate the last few words that unlock the spell. You gag slightly as the blood in your mouth congeals, but disappears even as your release the spell.

You taint a single living creature's blood with a hot corrosive infusion dealing 1d8 points of fire damage and 1d8 points of acid damage per round. The subject can attempt a CON save each round to negate the damage, but does not prevent damage in future rounds. Searing pain limits the subject to one action per turn when it fails its CON save. The subject will not be able to use its reaction for the duration of the spell if it fails its CON save for that turn. 

This spell does not affect creatures of the construct, elemental, ooze, plant, or undead types.

*Adapted from the 3rd edition spell compendium