Gentle Repose

Necromancy (Black) Tier: 3 Components: Verbal, Somatic Casting Time: 1 major action Range: Touch Target: Corpse touched Duration: 1 day/level Saving Throw: None Don’t worry. We’ll get help.

You preserve the remains of a dead creature so that they do not decay.  The spell also works on severed body parts and the like.

Augmentation:If you cast this as a tier 4 spell, the effect is permanent. This application requires the use of a quantity of gold dust worth 5 gp.