Within the Cosmos, there was already something that was pretty similar to the Worldeater Species, yet it was fundamentally different in several areas.
One of the Scourges of the Cosmos, together with the Orks and hostile Outer Gods that were doing what they wanted... the Zerg Swarm.
And yet, contrary to the Worldeater Species, the Zerg Swarm, no matter how big it was and how many World have fallen prey to it, were not that dangerous to the balance of the Cosmos in the first place.
Samiel knew why...
The fundamental origin of the Worldeaters was too terrifying.
They are creatures of the Void that use the resources of a World in order to grow. Within the depths of the myriad Worlds of the Material Plane of the Cosmos, they are a powerful species that can eat anything, viewing all life with Soul as its food.
They are the natural enemy of all life; their very own existence presented the antithesis to the concept of life itself.