Marvin returned to Feinan through the Teleportation Gate opened by Louise.
The Gate led to that cave in the Lumber Woods.
Unsurprisingly, Professor, Kangen and the other Metallic Dragons were all there.
Professor let out a sigh of relief when he saw Marvin appearing.
After being warned by Louise that Marvin had been taken to the Elemental Plane of Water, he had felt rather worried about it.
Let alone a mortal, even a powerful Dragon wouldn't be more than a lizard in front of an Elemental Sovereign.
Although Louise was Kangen's friend, that woman had always been temperamental. Who knew what could happen?
Now that Marvin returned safely, he finally felt relieved.
Due to them arriving relatively late, Kangen and Professor found out that their point of arrival had been shifted when going through the Teleportation Gate.
They didn't appear in the Nightmare Boundary, ending up in another place instead.