Like Arborea, Dream Land was a Secondary Plane.
It was reasonable to say that with Marvin's current strength, he normally already couldn't enter this Secondary Plane.
But he had that unique being at his side.
An Eternal Time Dragon.
There wasn't much known about Eternal Time Dragons, but there was no need to doubt their formidable abilities.
Even as a young Dragon, Tiramisu could slap the War God in front of all the Gods of the Universe.
Entering the Secondary Plane by craftily exploiting a gap in the Spatial Laws was nothing to Tiramisu.
The plundering duo discussed their plan in advance.
Tiramisu used his powerful Time Ability to control all the interconnections of the entire Secondary Plane.
That way, he could delay the exposure of the situation so that unless the Dream God directly investigated his Plane, even he wouldn't notice his territory being profaned.