Impalers were creatures that were supposed to appear in the base game but were inevitably cut.
Appearance
They resemble barnacles at first glance however they open up to reveal many tentacles and 2 sharp tentacles which they use to impale creatures, their roots are below the ground meanwhile the main body is typically on overhangs and cliff edges.
Locations
The Impalers inhabited Desert regions.
Behavior
Impalers lie in wait for prey to come along, they will then impale the creatures passing by killing them in order to feed the roots below.
Reasons for being cut
They were eventually removed due to being too difficult to spot and didn't require the help of teammates like the Carnivorous Plant did.