The dreary coloration of Mournstrom eggs is offset by their brilliant sheen when exposed to sunlight. At daybreak, Mournstrom-rich waters put on a gorgeous display sometimes said to rival the mystique of Ark's own auroras.
Mournstroms collect themselves in great numbers near the wreckage of ships and other sunken structures.
An ominous correlation between Mournstrom colonies and the appearance of violent whirlpools has been observed by the Science and Research Center, although the causation has yet to be determined. This discovery has only exacerbated the species' age-old association with ill omens.