From the knowledge in the blood of their father, the Ancient Primordials knew that he was older than the present Existence, and so they knew of previous Existences. However, knowing how long the lifespan of an Existence was, the Ancient Primordials believed that perhaps only ever been a few dozen Existences, and if they could stretch the boundary of their imagination, they could say a hundred at most.
This was not a wrong assumption, because technically, the lifespan of an Existence is equal to that of a Primordial, and that was nearing true infinity, and only Primordials could comprehend time at such a scale.
And so, while Death had revealed it was consuming the Origin of previous Deaths, they had been amazed but not panicked. Even though Origin Force could be deemed equal, that was technically not the case, as a lot went into the individual behind it and the understanding of their Origin.
