This carcass belonged to a race of insectoid monster called Zerjs. This race was actually not from any particular world and was born inside a tiny void realm. Void realms were small sized dimensions present in the void that had not managed to become a complete world with a will but had a framework that a world would also have. It was quite similar to Elena's mini world.
This void realm was located in a very remote part of the universe, so for a long time no one had found it and the Zerjs had managed to propagate inside without any restrictions for millions of years.
This way, they had managed to become incredibly strong through various types of evolution. And when they had reached the limit of that void realm, these insects had devoured the void realm itself and had came out into the true void.
The instictual nature of these insects was of murder and destruction. So immediately after coming out, they had started to attack the various worlds which were nearby.
