There are two sets of targets. The first are creatures within the 10-foot burst, who are entitled to Will saves and spell resistance to negate the harmless effect. The second are creatures caught within the cone of bright scarlet energy, who are entitled to reflex saves and spell resistance to negate the effect. A creature caught in both the burst and the cone is treated as if they were only in the cone.
Each creature affected by either the cone or the burst is surrounded by a personal glamer that causes them to treat the creatures caught in the burst as if they were under the effect of an invisibility spell (burst-affected creatures can see themselves, but not other burst-affected creatures). If any burst-affected creature moves more than 30 feet from any other burst-affected creature, or if a burst-affected creature attacks a cone-affected creature, the spell ends for all recipients. If the distance between any cone-affected creature and any burst-affected creature becomes more than the spell's range, the cone-affected creature is no longer affected by the spell.
Material component: An eyelash encased in a bit of gum arabic.