Tremorsense

Underdark (Und)Updated Forgotten Realms (3.5)

Tremorsense is a D&D 3.5 spell (Transmutation) from Und. On class lists for Harper Scout (Level 3), Ranger (Level 3), Sorcerer (Level 3), and others. Range or area: Personal; Saving throw: Will negates (harmless); Duration: 10 minutes/level (D); Casting time: 1 standard action.

School
Transmutation
Casting Time
1 standard action
Components
V, S, DF, F
Range
Personal
Target
The caster
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.