Two days later, Michael was still undecided about what to do. However, he learned more about the bridge Eren had been talking about and how it worked. The galaxies were connected through a portal that worked similarly to the isolated dimension of the Interdimensional Flag War.
One had to enter an isolated dimension, where one could step through one of countless portals resembling Runic Gates. One of the portals would lead to the galaxy where the Nest was hiding.
Eren didn't tell Michael specific details about the Nest's hideout anymore, but that was unnecessary. Michael didn't have to know everything about the Nest just yet.