A Thousand Cuts

A Thousand Cuts
For early edition D&D and clones:
(Magic User 3) Range: as weapon. Duration: five rounds plus one round per level
This spell is cast by the magic user muttering dire prognostications about the target's future, while preparing a dagger to be thrown. Upon finishing his incantation, he attacks the target with the dagger (thrown or melee). This attack is made as if by a fighter of the magic user's level. If it hits, the target takes damage as normal from a dagger strike, and the dagger returns to the wizard's hand. Each round following for the spell's duration, an invisible blade inflicts a fresh wound on the target, doing damage as a dagger of the same type as was used in the casting.
There is no saving throw.