Putrefaction

This vile spell spoils all food and water in the area of effect. Magical potions and holy water may be ruined; roll 1d20 for each potion or container of holy water in the area; a roll of 8 or more (that is, the saving throw of a 12th-level wizard) leaves the fluid unaffected.

In addition, all creatures in the area of effect suffer 1d4 points of damage and must make a successful saving throw vs. poison. Those who fail suffer an additional 1d4 points of damage and are 25% likely to contract a rotting disease that will prove fatal in 1d6 months. For each month the rot progresses, an afflicted creature loses 2 points of Charisma permanently. Unlike mummy rot, the disease does not affect the curing of wounds.

The material component is a bit of rotten meat.