The Storage Ring of Immortal Artifact level is undoubtedly the Storage Ring left behind by the Xuanling Saintess after her death in battle.
In that great battle, the flesh of the Xuanling Saintess was obliterated, and the Demonic Plant Honored One only managed to save her spirit remnant and true spirit, thus being forced to seal her with a secret technique for reincarnation within a Dao womb.
According to reincarnation theory, this kind of action cannot actually be considered normal reincarnation but is 'smuggling'.
Because the true spirit of the Xuanling Saintess never entered the Cycle River, it was merely sealed to 'deceive' the Heavenly Dao Laws.
This is also why Bobo has always firmly believed that Sister Xuanling would return to her and why Bobo has been dutifully and quietly taking care of the relics of the Xuanling Saintess over the years.
The Storage Ring of Immortal Artifact was still returned to Liu Ruolan.
