"The Soul Gathering Array is now easy to deal with, but the Fermentation Barrels are not," said Lord Felen. "The Shadow Wood Material previously transported from the Land of Sealing has all been used up. Its conduciveness to Negative Energy is also very crucial. If we don't have Fermentation Barrels made from this type of wood, the difference in Negative Energy inside and outside the barrel will be significant. The higher the Negative Energy Index in the Spirit Gathering Cellar, the higher the demands for the barrels' conduciveness to Negative Energy."
This characteristic is related to the inert nature of the energy when its concentration is too high.
Below a value of 1, Negative Energy remains in an intangible, shadowless gaseous state.
Above 1, it generally turns into a black fog.
As the value increases, the severity naturally worsens. When unobstructed, its fluidity is imperceptible, but once there's a physical barrier, the difference in levels becomes immediately apparent.
