Creatures in The Half-Life Series - Race X - Sprite

Sprite

Taking on the appearance of what looks like a flying ball of light, Sprites are creatures that can be seen floating through the facility several times during the game, becoming more frequent in later stages of the incident. However, they cannot be harmed and do not hurt the player in any way. On occasions they even seem to be guiding Adrian. In the scenario where the Gargantua is trapped on the Sector G hydroelectric dam, sprites fly into a portal nearby which the G-Man then steps through. They eventually all lead to a massive violet portal that brings the Gene Worm in. At the time Gordon Freeman pushes the Xen crystal into the Anti-Mass Spectrometer, many Sprites fly towards and away from the resonance cascade, the former of which also happens when the portal to Xen in the Lambda reactor core is fully opened.