Things that can provide energy to a Symbiotic Contract are probably just those few types, like Demon Cores, Gems, and the like, depending on which one the Symbiotic Contract needs.
Li Xiu's Symbiotic Contract is called the Evil Spirit Token, and the Symbiotic Talent is Twin Souls, a talent that both Li Xiu and the Evil Spirit Token now share.
In other words, whatever the Evil Spirit Token needs to level up, Li Xiu also needs the same things to increase his level, and their energy is shared. Whoever absorbs it, it's essentially the same, indistinguishable from each other.
After researching the Twin Souls talent, Li Xiu's expression became peculiar.
Li Xiu originally thought the Evil Spirit Token would require Ruby and Sapphire to upgrade, but it seems that's not the case now.
The Twin Souls talent doesn't need any gemstones to grow, but it requires another Symbiotic Contract.
