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Determine Depth

Source Dungeoneer's Handbook pg. 30
School divination; Level arcanist 2, bard 2, druid 2, hunter 2, skald 2, sorcerer 2, wizard 2

Casting

Casting Time 1 standard action
Components V, S

Effect

Range touch
Target solid surface touched
Duration concentration, up to 1 round/level (D)
Saving Throw none; Spell Resistance no

Description

With a touch, you can determine the exact thickness of a wall, ceiling, or other solid barrier, measuring from the point you are touching to the direct opposite side of the barrier in a straight line. You can only detect depths or widths of up to 10 feet per caster level (maximum 200 feet at 20th level); amounts in excess of this limit are detected as being the maximum you are able to detect. So, for example, a 5th-level wizard using this spell on a 60-foot-thick wall would detect that the wall is 50 feet thick.

Determine depth can be used on earthen, plaster, stone, or wooden surfaces, but not on walls made of metal or other, harder materials. This spell is useful to casters who want to get an idea of their surroundings, and as a preliminary measure to casting spells such as passwall or dimension door.