Turrets are one of the odd Fungi Creations that serve the Shapers as an immobile range weapon. They are intelligent enough to discriminate friend from foe. Turrets themselves come in several different types depending on the needs and skills of whatever Shaper creates them. While it is never made clear, it might be possible for non-Shapers to breed turrets like they do with many of the other Fungi Creations.
Once they are planted/created they cannot move from that spot without dying. From their perch, they launch massive thorns at their enemies using the same mechanisms as a thorn baton. These thorns are dependent on whatever type of the turret launches it: regular, venom, acid, submission, and reapers. Upon death, turrets' thorns can be collected and used by the player for his thorn batons.