The party undertakes an expedition to the Ruins of Orboben

Expedition

The party is hired by a crew leader of the Discreet Trade, Etulva Qirelva, to retrieve a disc from the nearby Ruins of Orboben in the swamps of the Avulan Lowlands.
  They travel to the ruins and recover the disc, but unleash an unexpected magic that puts them out of time for 188 days. When they return to normal temporality, their keelboat had long since departed, so they make their way back to the city on foot.