In the end, Elaric, Andelia, and Mirlin truly didn't like what Zack had decided to do. If he could defeat and control them afterward, why not? It was obvious that they would betrayed at the first chance.
The group headed toward the stone fortress on the back of the giant turtle, and soon, Zack was able to see the place. It wasn't anything fancy, but at least it had some countermeasures against the powerful heat and the sandstorm.
Stone is a poor conductor of heat, meaning it doesn't transfer heat easily. A thick stone structure can keep the interior cooler than the blazing heat outside during the day. Stone fortresses are often built with thick walls and sturdy construction, which can withstand the force of strong winds and sandstorms without collapsing.
Fortresses typically have small windows and tightly sealed doors. This design prevents sand and heat from entering easily, maintaining a more stable and comfortable environment inside.