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.