As phantasmal killer, except it can affect more than one creature. Only the affected creatures see the phantasmal creatures attacking them, though the character sees the attackers as shadowy shapes.
If a subject’s Fortitude save succeeds, the subject still takes 3d6 points of damage and is stunned for 1 round. The subject’s Strength score also drops 1d4 points for 10 minutes. A stunned creature can’t act and loses any Dexterity bonus to AC. Attackers gain +2 bonuses to attack it.