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Progression walls are a common occurrence between any of the living beings in Kritias that share the System.
Whenever someone begins to grow exponentially faster without stopping, it will sooner or later hit such a progression wall.
Progression walls are not something created by the System, but something within the soul of a person.
To begin with, the System itself is a divine creation given to the intelligent races to boost their growth in strength, offer corrections, and also the possibility to improve faster. So they could have a chance against the endless hordes of monsters that quickly began to fill the world of Kritias as dungeons spawned one after another.
The monster ended up benefitting from it due to the intervention of the Demon Gods, which made things even more complicated for the intelligent races, but that is a different story.
