The Impolustors are zombified impostors that got possesed by a Polus' Parasite. Their skin is rotting due to the host being dead, making these creatures barely live days, weeks or even months if they have a bit of luck.
They're extremly agressive towards anything that isn't another Impolustor, being a dangerous threat due to their massive speed and agility. They dont possess any technology nor weapons the impostors have, so all they can do is use their physical strenght. Remember when i mentioned that they're in a constant state of rotting? This means that the most recent Impolustors are stronger than the older ones, because time makes their strenght go down.
When an Impolustor dies, the parasite controlling it leaves the body and feasts and releases eggs on it, as there's nothing more to do with it. Both the Impolustor and the parasite share their hunger, so the Impolustor needs to eat or the parasite may die.