The invisibility ray was a device the Trio created that made anyone and everything that was hit by it invisible. The device used the Illuminata diamond to power it.[1]
History[]
The Trio intended on using the invisibility ray on themselves to sneak into an all-women's spa. However, it overloaded when they saw Buffy passing by and the beam hit her, making her invisible. The mass amounts of energy that blasted Buffy began to slowly break down her molecular structure and would have eventually caused her body to disintegrate.[1]
The Trio made themselves invisible to sneak into an arcade with Willow as hostage. However, Willow warned Buffy when she discovered Warren intended to use the invisibility ray on Buffy again to disintegrate her. While an invisible Buffy confronted the invisible Trio, Willow used the device to made them visible again.[1]