Transmutation [Cold]
Level: Druid 1, Ranger 1
Components: V, S, Frostfell
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Area: One 20-ft.-by-20-ft. square of snow/level
Duration: 1 hour/level
Saving Throw: None
Spell Resistance: No
An area of fallen snow designated by you becomes hard and crumbly, generating a loud crunch when stepped upon. Creatures take a –20 penalty on Move Silently checks when traveling through crunchy snow.
Source: Frostburn, page 92.