There were unkillable creatures in the world.
They might be weaker than Progenitors, but some of them still had the strength of a Colossi.
However, they were immortal creatures who wouldn’t die no matter how many and how hard you try, making them practically invincible in their own right.
And against all odds, one Primordial Progenitor stood against them.
She was an angel that had fallen from Heaven due to her own wishes, for her conscience couldn’t turn a blind eye to the weak and innocent being trampled by the beings who held absolute power in the world.
It could even be said that it was all thanks to her mercy that the human race, as well as the other races, were able to survive the great calamity of extinction, safe from the creatures that knew no rest, no exhaustion, and no fear of death.