This spell ensures that a dead dragon's spirit passes for all eternity to the Outer Planes. Once it is cast on the corpse of a dragon, that corpse cannot be animated or resurrected. The dragon itself cannot be contacted by spells such as speak with dead. The spell has no effect on a corpse that has been animated at any time before eternal sleep is cast, not does it have any effect on dracoliches or other undead creatures.
The material component is the priest's holy symbol.
Notes: Restricted to dragons. Granted by Null. the Death Wyrm, of the Forgotten Realms setting. This spell is also known to exist as an innate spell-like ability.