Nondetection

(Player's Handbook v.3.5, page 257, DnD 3.5)

Abjuration

Level: ; Ranger 4; Sorcerer/Wizard 3; Ebonmar Infiltrator 3; Slayer of Domiel 3; Fatemaker 3; Beguiler 3; Telflammar Shadowlord 2; Thayan Slaver 3; Sha'ir 3; Urban Druid 3; Court Herald 3; , Trickery 3
Components: V, S, M
Casting Time: 1 standard action
Range: Touch
Target: Creature or object touched
Duration: 1 hour/level
Saving Throw: Will negates (harmless, object)
Spell Resistance: Yes (harmless, object)

The warded creature or object becomes difficult to detect by divination spells such as clairaudience/clairvoyance, locate object, and detect spells. Nondetection also prevents location by such magic items as crystal balls. If a divination is attempted against the warded creature or item, the caster of the divination must succeed on a caster level check (1d20 + caster level) against a DC of 11 + the caster level of the spellcaster who cast nondetection. If you cast nondetection on yourself or on an item currently in your possession, the DC is 15 + your caster level.

If cast on a creature, nondetection wards the creature's gear as well as the creature itself.

Material Component: A pinch of diamond dust worth 50 gp.