Inaccurate?

Tremorsense

(Underdark)

Transmutation
Level: Harper Scout 3, Ranger 3, Sorcerer 3, Wizard 3,
Components: V, S, AF, DF,
Casting Time: 1 standard action
Range: Personal
Target: You
Duration: 10 minutes/level (D)
Saving Throw: Will negates (harmless)
Spell Resistance: Yes (harmless)

You can automatically pinpoint the location of any object or creature within 30 feet that is in contact with the ground.
Arcane Focus: A fleck of skin from a creature that has
tremorsense.

Also appears in

  1. Spell Compendium