Venomfire

(Serpent Kingdoms, DnD 3.5)

Transmutation[Acid]

Level: ; Cleric 3; Druid 3; Ranger 4
Components: V, M
Casting Time: 1 standard action
Range: Touch
Target: Creature touched
Duration: 1 hour/level
Saving Throw: None
Spell Resistance: Yes (harmless)

You cause the subject's venom to become caustic, dealing an additional 1d6 points of acid damage per caster level with each use.
This spell has no effect on creatures that do not naturally produce poison.
Material Component: A drop of acid.