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Inaccurate?

Spikes

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

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.

Also appears in

  1. Spell Compendium
  2. Complete Divine