Level: Assassin 2, Druid 1, Ranger 1
Components: V, S, DF
Casting Time: 1 standard action
Range: Touch
Targets: One creature/level touched
Saving Throw: Will negates (harmless)
The subject or subjects can move through any type of terrain—mud, snow, dust, or the like—and leave neither footprints nor scent. Tracking the subjects is impossible by nonmagical means.
Source: Player’s Handbook (version 3.5), page 259.