Once the formation was activated, no one was allowed to enter or leave.
To make it easier for clan members to come and go, Wang Daoyuan also refined several tokens.
After presenting a token, a small opening would appear in the defensive barrier, temporarily allowing passage.
Such a formation was still imperfect, and outsiders might be able to slip in.
A large island could not rely on this one formation alone.
Other formations would need to be set up in the future, or spiritual artifacts used to prevent outsiders from sneaking in.
For the current formation, magical artifacts were also used to anchor it.
The Dragon Scale Water Repelling Shield Wang Daoyuan had refined earlier was placed on the Water Attribute formation base.
After all, they were on an island, surrounded by seawater and ice.
To defend it, they needed at least some water-controlling capability.
Tianfu Island was a Volcanic Island, and its area was slowly expanding.
As lava continued to overflow, its boundaries kept extending as well.
The coverage of a sixth-order formation could also be adjusted. When the island grew larger in the future, they only needed to adjust its range.
It was like the formation at Absolute Heaven Abyss. Back then, the Returning Origin Sword Immortal had cleaved Absolute Heaven Abyss open with a single sword strike; Wang Daoyuan had witnessed it firsthand in the illusion.
When he had previously examined the break in the Skyrend Mountain Range, he found that the mountain itself extended several dozen li into Absolute Heaven Abyss.
The same was true on the Eastern Sea side. By rights, the north bank of Absolute Heaven Abyss should have been entirely ocean.
Yet after emerging from Absolute Heaven Abyss last time, he found a mountain range dozens of li wide there.
Whether it was