Cultivation manuals in the whole Three Heavens are divided into 9 Ranks, with Rank 1 being the lowest while the Rank 9 is the highest and most treasured.
However, in the Lower Heavens, cultivation manuals that were known to exist were only from Rank 1 to Rank 5.
There were only three known Rank 5 cultivation manuals, excluding the Unranked ones like the Gracious Sword Technique.
This technique was termed unranked because no one could properly judge its Rank. It could help the cultivators in comprehending Sword Intent, which should have placed it in above Rank 5 category however, except for Yuan Xuming, no one ever succeeded but instead they suffered Qi Deviation, so this manual should be placed in Rank 1 rather than above Rank 5. In the end, it's rank was not decided, and it became Unranked Cultivation Manual.
As for Rank 4 cultivation manuals, they were always a rarity even in top powerful sects and organizations of Lower Heavens.
