Innate living beings are divided into four levels, from highest to lowest: Innate Saints, Innate Divine Demons, natural Gods, and Innate living beings, each corresponding to the four realms of Immortal Dao: Primordial Chaos, Daluo, Taiyi, and Celestial Immortal.
This means that Innate living beings possess the potential to become immortals; natural Gods, as long as they do not die, can basically become Taiyi Golden Immortals; Innate Divine Demons are meant to become Great Luo Golden Immortals; Innate Saints are to become Primordial Chaos.
The great achievers of Ancient Martial Arts, at the moment of their fall, have essentially ascended to the level of Innate Taoist Master, corresponding to Innate Divine Demons.
Therefore, when resurrecting them, this world nurtures them to the standards of Innate Divine Demons. Their treasures, which they cultivated along with their lives, are also nurtured as Innate Spiritual Treasures.