After the Zhang family recovered from their injuries, they had already collected all the Flame Crystal Stones near the Fire Sea.
After all, they didn't have Lin Chen's methods to resist the Fire Sea magma, and most of their cultivation techniques weren't Fire Attribute; many were even Water Attribute, so they couldn't even stay near the mountain edges close to the Fire Sea.
Ultimately, the Zhang family decided to withdraw from the Fire Sea area and move to the outskirts of the island.
But the Zhang family couldn't understand why Yun Kaige and the Black Yan Hall folks were so fixated on Lin Chen, insisting on ambushing outside the island, waiting for Lin Chen to emerge.