"This trip has been very successful. Let's go back now and try to hunt some more demons, and see if we can obtain skills more suitable for you." The two sisters still lacked a sufficient amount of skills.
Unfortunately, their skills could only be maximized when they absorbed and transformed the power of the demons. This eliminates the possibility of massively buying skills to arm the two of them.
It appears that one should not easily forfeit this world. They should revisit this world whenever there is an opportunity, at least for obtaining skills. Unfortunately, their luck has not been good so far as they had not obtained world coordinates.
Perhaps hunting more demons will increase their chance of obtaining new world coordinates.
However, as Du You was preparing to leave, he failed to notice that from the beginning, there were ripples continuously spreading from the black pool which had been still all along.
