A tragic experiment involving a gecko and ionizing radiation. A group of Aforerian scientists subjected the lizard to the energy by mixing uranium and other toxic substances in its food as a way to study the effects of such chemicals on diet. The experiment started in the year 5750.
While most geckos on the experiment died quickly from cancer and other complications, Gomo'o started to grow unusually. It incorporated tungsten onto its scales and uranium in its bones. Its size started to massively increase as well, and in a week it was the size of a tegu, in a month the size of a saltwater crocodile. While at the start its hunger clearly increased, over time it became more tempered. The scientists speculated it may have started to feed on its own radiation.
While not hungry anymore, it still displayed predatory behaviour, occasionally attacking staff, perhaps out of habit or for fun. Its bites, of course, severely poisoned the patients. Gomo'o was subsequentially contained in a closed room. It was periodically "enriched" with prey to maul.
Eventually, in the year 5751, Gomo'o fled while the scientists tried to change its room. By then it was about 30 m long and had neural glowing spines on its back. It quickly swam into the ocean by a research port and outran all vessels. The experiment was never exposed to the public.
He gained a light-blue halo composed 25% of radon, 5% of plasma and 1% of glaze. It is shaped like lightning.