This spell was mentioned on page 18 of the Gamemaster Book (RQIII AH version) but was never published in the Magic Book. Details are transcribed from Heroes Magazine Vol 1 No 6 . Republished here as a service to RuneQuesters who do not have access to the magazine in question.
Instant, non-stackable, reusable
This spell acts as a sword to cut the bond between body and spirit of the target. The user must make a successful magic points verses magic points roll. If successful, the target dies. If unsuccessful, the target takes 1D6 damage to his general hit points, with effects similar to poison damage.