Exuvuz

After reaching Level 17, Nymva evolves into Exuvuz, a stage in which its body becomes less mobile, and it hops around on its stinger. It stays underground most of the time, as it has no need to hunt. It is built to hibernate, after all. Interestingly, the body temperature of Exuvuz dramatically lowers during this stage, so it evolved an electric mane around its head that is supposed to give it makeshift vitamin D and keep it warm. In rare cases where they are dug up by some animal, they use their wings to fly in short bursts, diving headfirst wherever it's headed.