The Heavenly Artifacts, known as 'divine artifacts', can autonomously give birth to souls, also known as artifact spirits.
Because these souls are born from the divine artifacts themselves, they are called 'innate artifact spirits'.
The immortals' treasures, as 'Immortal Artifacts', lack the ability to autonomously birth souls and can only seal a certain living being inside to make it the artifact's 'artifact spirit'.
Like Elder Fire, who was sealed inside the Jewel Tower to become its 'Tower Spirit'.
Such Immortal Artifact spirits like Elder Fire are also known as 'acquired artifact spirits'.
Though acquired artifact spirits come from outside the Immortal Artifact, once they become the artifact spirit, unless the artifact's owner willingly severs its connection with the Immortal Artifact, they cannot leave the artifact.
Innate artifact spirits, though birthed from the divine artifact itself, can freely leave the artifact, able to travel the vast world.
