Mamato and Gfukei's group were truly in the middle of nowhere, far from the Divine Realm or anything else. So, how exactly did the twins' group even know where they were waiting for them?
The explanation lies with Aby. Sure, the system allows the twins' group to use the Abyssal Paths safely. However, that's about it. Aby, however, knows the Abyssal Paths like no other. Although he lost his body, he did not lose his experience and knowledge.
To get him back, Roan used the Relay Node back in A1 and went to meet Aby in a location they had agreed on. Then, obviously, he simply brought Aby inside the Celestial Soul Dimensional Realm and then came out of it by Rean's side in the Werdlem Universe again.
From there, they thought of a plan to get a body for Aby. Due to the search of the empire and the knowledge of the Abyssal Beasts, Aby could tell more or less where he would try to set up an ambush like the one the twins' group suffered before.
