You get lost easily in the woods. That's why they've left their minions here and there to mark their path.
Taking in the enemy force, Alex and co. were literally able to move smoothly, and they targeted the Dark Pyroxene Army next. If the Dark Pyroxene was the source of energy for the Vanity Deities, then naturally it should be planned to destroy it, in order for them to become powerless. -from final section of "New Record of the Strange World" chapter Pyroxene Three-