Tentacle (Half-Life)

Tentacles are one of the most perplexing Xen creatures. they are immune to all manners of firepower, even the gauss cannon. Tentacles are connected to a base which resembles a teardrop. the "arms" of the creatures are long, green, and clawed. tentacles are blind and track humans by sound. only by superheating the tenticals base and burning it to the point of incineration.