uncommon abjuration 

Traditions arcane, occult

Cast 10 minutes (material, somatic, verbal)

Range touch; Area 100-foot burst

Duration until the next time you make your daily preparations

From outside, the area looks like a bank of impenetrable black fog. Sensory stimuli (such as sounds, smells, and light) don't pass from inside the area to outside the area. Scrying spells can't perceive any stimuli from the area, and mind-reading effects don't work in the area.

Core Rulebook, page 360.