However, the Spirit Barrier of the Star Marrow Altar has already reached the limit of what humanity can create. Its shielding strength has far surpassed the best barriers from Yanuo and Saint Longde's era, yet the intensity of the Black Fog is so high that the pressure it exerts on the barrier exceeds its limits.
Great scholar Amides once said that in such a situation, the barrier must never be closed completely; a sufficiently large gap must be left so that the penetration pressure of the Black Fog will not break through the barrier, but will instead concentrate on this gap.
Moreover, the range covered by the barrier cannot be too large, otherwise the pressure on the gap would increase dramatically. This is why the intensity of the Black Fog in front of the Royal City has reached the Seventh Level, far exceeding the Fifth Level in other nearby areas.
