Herb Hall 31-A3 is one of the uncommon herb halls in Astral Garden Tower. In this herb hall, a faint amount of spatial energies would be extracted from the astral energy sucked by the tower and processed before releasing into this hall to give the spatial properties of the plants here.
The books I had found said that the process is very expensive, and only 2% of the plant getting any spatial properties.
Now, after thousands of years, the Astral absorption array to the tower had lost more than 99.9% of its capabilities.
If the tower could absorb even 1% off astral energy as its had at its peak, Tyrants would not have been able to stay here, and the quality of herbs would have been much better, and there would be more astral-type herbs and than it is.
It is good news for me and others that this tower had nearly lost all its capability; it is the only reason why I am standing here.
Creation is hard, cheer me up!