You wreak havoc with the inner organs of a target, causing it to grow ill.
Prerequisite: Ability to cast 3rd-level spells.
Benefit: As long as you have a necromancy spell of 3rd level or higher available to cast, any living creature you hit with a melee touch attack becomes sickened for a number of rounds equal to the level of the highest-level necromancy spell you have available to cast. The subject can reduce this duration to 1 round with a successful Fortitude save.
As a secondary benefit, you gain a +1 competence bonus to your caster level when casting necromancy spells.
Source: Complete Mage, page 47.