Spikes

(Defenders of the Faith: A Guidebook to Clerics and Paladins, DnD 3.0)

Transmutation

Level: ; Cleric 3; Druid 3
Components: V, S, M
Casting Time: 1 action
Range: Touch
Target: Wooden weapon touched
Duration: 1 hour/level
Saving Throw: None
Spell Resistance: No

As brambles, except that the affected weapon gains a +2 enhancement bonus on its attacks, and its threat range is doubled.