Su Changxing took a black coin out of his pocket and said, "This might be a new way of communication if we can figure out how to stably create mysterious items."
[Talking Coin (Lower Rank of Dingguan): Coins can connect with each other, functioning like walkie-talkies, effective within a hundred kilometer range.]
This black coin is something he found in the Doomsday Shop, and there aren't many of them, probably just enough for their group to use.
Moreover, the price is exceptionally expensive, each coin costs 2,500 points, and even though Su Changxing is rich in points, he only bought them after much consideration.
If they can understand its principles, then they might be able to create them, as the Extraordinary Domain also possesses inherent laws.
This is not much different from science; after all, it's just another form of science with a completely different underlying framework.
