env_sporetrail

This entity is not in the stock FGD files by default. It should not be placed (in Hammer) because it won't do anything.

Code classes:

• SporeTrail
• CBaseParticleEntity
• CBaseEntity (all ents)

env_sporetrail is a point entity present in all Source games. It's an unused effect that would follow a bugbait projectile in midair.