Synesthesia, Mass

School: illusion (phantasm) [mind-affecting]

Level: Psychic 7, Mesmerist 5

Casting Time: standard action

Components: V, S

Range: medium (100 feet + 10 feet/level)

Target: creatures, living (1 or more) no two of which can be more than 30 feet apart

Duration: 1 round/level

Saving Throw: Will negates

Spell Resistance: yes

Source: Occult Adventures