From D&D Wiki
|This material is published under the OGL|
School necromancy; Level cleric 4, druid 5, witch 5
Casting Time 1 round
Components V, S, M/DF (ashes and a vial of holy or unholy water)
Target one dead creature touched
Saving Throw none; Spell Resistance no
You place a curse upon a dead creature that bars its spirit from returning. Anyone casting a spell that would communicate with the dead creature, return it to life, or turn it into an undead creature must succeed on a caster level check with a DC of 11 plus your caster level. Rest eternal cannot be dispelled, but it can be negated with remove curse or break enchantment.