Rith was the most dangerous continent but it was not due to the Demon Empire or the twisted Conclave at each end of the continent. It was due to the Dread Desert. It was a desolate stretch of land that had a strange effect on cultivators.
It was very thin for Qi but it was not a Ruin or other structure but the beasts that lived there that sucked the Qi out of the very world. They were named quite simply, dread snakes for that reason, hence the name of the desert.
Rather than be a place to find treasures or an Inheritance, it was a place of death. The Qi inside a cultivator not only drew the snakes, but it was pulled out the more powerful a cultivator was.
A Sky Realm would quickly be unable to fly after only a few days there but flying artifacts would work for a month at grade 4. Grade 3 lasted longer but would lose functionality faster due to the limits of the materials and inscriptions.