Hunter's Mercy

(Ghostwalk, page 54, DnD 3.0)

Transmutation

Level: ; Ranger 1
Components: V, S
Casting Time: 1 action
Range: Personal
Target: You
Duration: 1 round

This transmutation makes a bow strike true. Your first hit with a bow (not including crossbows) in the next round automatically threatens a critical hit. If you don't hit in the round immediately following the casting of this spell, the effect is wasted.

This spell first appeared in Magic of Faerûn.