The Road Back Home

The cave fairy Zelya in map seems to have yet another request.

Zelya restored her precious map and tried to follow it back to her old home, but she could not make it past the fierce monsters blocking the way. She asked me to defeat the monsters west of the map to help her get home safely.

As Zelya requested, I defeated Aqumander and Echopuses. Yet it felt as though monsters continued to pour out from deeper within the cave. What on earth could be happening inside?