(Player's Handbook v.3.5, p. 243)

Level: Cleric 9, Warmage 9, Blighter 9, Death Master 9, Destruction 9, Abyss 9, Slime 9,
Components: V, S,
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One corporeal creature/round
Duration: Concentration (up to 4 rounds)
Saving Throw: Fortitude negates
Spell Resistance: Yes

You create a destructive resonance in a corporeal creature's body.
For each round you concentrate, you cause one creature to collapse in on itself, killing it.
(This effect, being instantaneous, cannot be dispelled).
You can target a particular creature only once with each casting of the spell.
Implosion has no effect on creatures in gaseous form or on incorporeal creatures.