Death Angel

Origin:
Most information about these creatures is unknown. Where they came from is unknown, how they procreate is unknown, and how they eat is unknown.The only place these creatures have been observed on is Earth.

They hunt by their hypersensitive hearing, locating anything that makes noise. They have also adapted to survive in the vacuum of space, hitching rides on meteors to reach their next 'destination'.

They boast an incredible amount of speed, as well as an impenetrable armoured shell, and are blind.

Interestingly, if there is a much louder noise near by, those who speak to each other cannot be heard by the death angels.

Invasion of 2020:
After meteors come in contact with Earth, the creatures have wiped out most of Earth's population over the span of 3 months. In the first hours of the invasion, military forces from around the globe begin to fight back. But the creatures' amoured shells proved too strong for bullets, bombs, and even bio weapons. Earth was eventually stripped from its freedom, as the death angels spread to new areas to further decimate the population.

Weaknesses:
There is such a thing as cochlear implant. If it is turned up to its higest volume, then placed into a microphone, the high frequency sounds will painfully disorient the creature. Enough of this high-pitched sound can kill a death angel, if not render it immobile for a period of time.

If the frequency is not enough to kill the creature, it will weaken it to a state where firearms can easily kill it.