Han Sen learnt more about Geno Seeds from Ji Yanran. Perusing the information she provided him, though, he noted that it wasn't very substantial. He did learn that Geno Seeds were able to absorb all manners of genes, and which genes they absorbed would affect what grew inside them.
Some could grow geno equipment, whereas others could grow creatures. Others could form spirits or beast souls. What they chose to grow was influenced by the energies they absorbed.
Humans and spirits knew how to create Geno Seeds that they favored, and this was accomplished by injecting the genes of their choice into one. Doing so would enable the altered Geno Seed to create what the injector specifically sought.
Different sanctuaries had different ways of cultivating Geno Seeds. And the stuff they produced was different from place to place.