The Most Ancient Beast, an old turtle known as the Longevity Immortal Turtle, had gained immense power through the crucible of ages.
Its fundamental ability was eternal life. As a Beast King Species, it slowly developed its Immortal Domain through this inherent immortality.
Initially, within the Immortal Domain, it was merely undying and indestructible. But as eons passed and its wisdom gradually grew, the Longevity Immortal Turtle's Immortal Domain developed various powerful abilities.
It ultimately became the most terrifying taboo in the sea.
In other words, it lived long enough to become the strongest in the world.
Initially, Beast King Species weren't born with their own Domain; they only possessed a fundamental ability. Only upon reaching old age could a Beast King Species undergo a qualitative change in their basic ability to form a Domain.
