Impaler

The impaler is a variant strain of the hydralisk that appears in Heart of the Swarm.

Overview
During Kerrigan's resurgence, Abathur discovered the impaler strain in an impaler colony. The Impaler Colony was a creation of the Overmind. After collecting the essence of the Impaler Colony, the Impaler was formed. The Impaler is able to launch tentacles that shreds through flesh, bone and armor.

Game Unit
It functions similar to a lurker with its ability to attack only while burrowed. However its attack is quite different, the impaler is only able to launch a single tentacle to an enemy that does massive damage. It has 11 range, and deals 20 damage to a single target, 30 to armored.