Warning: This is 3.0 Edition material. It is possible that there is more recent 3.5 Edition version.
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Persuade to Manifest

(Ghostwalk)

Enchantment (Compulsion) [Ectomancy, Mind-Affecting]
Level: Bard 2, Sorcerer 3, Wizard 3,
Components: V, S,
Casting Time: 1 full round
Range: Touch
Target: Dead creature touched
Duration: Instantaneous
Saving Throw: Yes (harmless)
Spell Resistance: Yes (harmless)

This spell sends a powerful signal to the soul of a creature that has died and not yet manifested on the Material Plane or passed on to the True Afterlife.
The soul immediately appears on the Ethereal Plane and can immediately make a Wisdom check with a +10 morale bonus to manifest on the Material Plane.
If that check is failed, the ghost may make Wisdom checks normally every minute to manifest.