Parasite (Ninjago)

"A few years ago scientists studied a meteorite that had fallen to Ninjago. It mostly came from the same comet you're on. Inside the meteorite, there were the fossilized remains of some kind of parasite that feeds on metal alloys. Do you hear me? Whatever you do, don't come in contact with the parasites. They eat through metal!"

- Nya warning the Ninja about the parasites.

These Parasites  are small extraterrestrial creatures that live on a comet known as Delta V. They look just look a beetle but have four legs, glowing yellow mandibles and with a green colour on their forewings. Parasites have an ability to eat through metal alloys.

History
Years ago a meteorite that most likely came from Delta V comet, was found and studied by scientists. While inside the meteorite were fossilized remains of an alien life form that fed on metal alloy.