Necrofriggian

Necrofriggians are a genderless species of moth-like sapient beings from the planet Kylmyys.

Appearance
Necrofriggians are humanoid moths with blue skin and blue wings with black markings. Their physical structure is similar to that of a human, and has a skull-like head with green eyes.

Necrofriggians from Mykdl'dy retain their Kylmyys cousins' physical structure but have bluish-white skin and light blue eyes.

In Omniverse, Necrofriggians are more muscular and slightly taller, their body frame being similar to a Neanderthal.

Biology
Despite the adaptation to cold environments, the Necrofriggans have the curious ability to withstand extreme heat as well. They asexually reproduce once every eighty years, devouring metal to use it to build a nest for their eggs. Once the eggs hatch, their offspring fly off into space to feed on solar plasma.

Necrofriggians are capable of flight and can become intangible like ghosts. They can also manipulate ice, and are incredibly strong despite their frail appearance.

Weaknesses
Necrofriggians are vulnerable to electricity.

Necrofriggians are especially vulnerable to the hypnosis of their predators the Psycholeopterrans.

Omnitrix Transformation
The Omnitrix's Necrofriggian representative is named Big Chill, who first appeared in the Alien Force episode "Kevin's Big Score". Big Chill has appeared in almost every subsequent series except the reboot.

The Ben Tennyson of Dimension 23 has an equivalent of Big Chill named Freezeghost, who first appeared in the Omniverse episode "It's a Mad, Mad, Mad Ben World: Part 2".

Big Chill has also been used by Albedo.