Welcome to the deserted town of Oerba, a beautiful place where all that remains of civilisation are Cie’th and ruins. How sad. A Vampire stumbles around just past the crack in the road and behind it is another Vampire and a Taxim. Before fighting anymore enemies, take the left path to the dead end and collect the Perovskite from the Sphere there.
Return to the path and take down the Vampire and Varcolaci. A Cie’th stone (Mission 28) can be found in the left corner just past the enemies you killed. Down the ramp is a cutscene where Vanille and Fang chat about their home and explain a few things about the Pulsian way of life.
After the chat, a massive group of Seekers and Chonchons guard the area ahead. Both enemies are quite weak and can be taken out with a few well-placed area of effect attacks like Thundaga. Watch your HP because it can diminish surprisingly quickly if you aren’t careful due to status ailments and the like.
Ignore the little house on the right but instead head up the stairs, killing or avoiding the Vetala lurking beneath the stairwell.