After a long time of being preyed on some Nuclear Worms increased in size, and even survived being consumed, now being resistant to digestive fluids, eventually becoming the Irradiator Worm. They are endoparasites, feeding on the cells of host, of even just the host itself via releasing just enough radiation to kill cells so they can consume their contents. When inside a host, they reproduce like crazy and can cause massive damage to them after some time, sometimes even killing them with the radiation itself. Once their host dies, their activity drops and they become decomposers, simply just rotting away at the organism they lived in, and wait for another to consume them so the cycle can continue.