This vegetation is only found in the Pagan inhabited sewers of South Quarter (Into the Pagan Sanctuary). It is a monocotyledon, possibly related to the bladderwort or the Madagascar lace leaf. It is wholly translucent, having outstretched root-like offshoots and long slender leaves in continuous motion.
Although they appear much shorter, these plants are about the height of a man. They are completely invulnerable, but have been known to disappear if objects are thrown at them. When Garrett first approaches either of the two aquatic plants, it can be seen to rotate to "face" him. It will also turn in the direction of a noisemaker if shot from a distance before approaching.
Viewed from above
Aquatic plant, unalerted