The journey through the Great River of Gold was more harrowing than expected, Rex was literally living a horror life throughout this journey.
In the day, he was affected by the extreme heat despite countermeasures that he already employed against them and the powerful beasts that roamed the desert at this time.
In the Great Desert, the apex predators were the giant Sand Worms which every desert traveler feared.
With their gigantic sizes that could dwarf ships, and with their capability to freely manipulate the desert sand, they were extremely dangerous beasts.
Having learned of their ways and patterns, Rex also had to give special attention to them every minute of the day to avoid attracting their attention.
In the past 3 days as he traveled through the desert, he already met these apex predators on 2 occasions as they hunted other travelers and beasts.