Aryll
From superman.nu: Supermanica
Aryll
An alien planet in another star system that is the home to a race of extra-sensory perception gifted humanoids, such as Klaxxu. Members of the Aryllian race can be poisoned by the traces of helium within Earth's atmosphere, though periodic ingestion of a chemical solution made from formaldehyde will counteract the effects of helium on an Aryllian's system (SF No. 197/1, Oct 1979: "Superboy's Split Personality").
