Amon had less than a month left, so he immediately got to work. He went to the area where he had seen the wild spirit herbs before. The soil there would certainly be fertile.
He spent days transferring the soils into his black space ring. He did feel the soil in this ancient dimension contained more aether than the soil outside. So he had to bring as many as he could while he was here.
The labor took a long time considering he had to scoop the soil before it could be transferred. Unlike water where he could simply put his ring inside and had it suck the water in.
Every time he had placed sufficient soil, he would place the spirit herbs in.
When the land inside his space ring grew, the water he absorbed from the cavern was no longer sufficient. He had to find more water. He had encountered several rivers during his journey before entering the pyramid, so he went to one.