This Secret Technique divided a cultivator's aptitude into several tiers, each with a different upper limit.
From lowest to highest, these seven tiers were: Low-Grade, Middle Lower, Middle Grade, Middle Upper, High-Grade, Upper Upper, and Top Grade.
Low-Grade aptitude usually belonged to Five Spirit Roots Cultivators. Their comprehension was extremely poor, and their conversion of Spiritual Qi was unsatisfactory. Without some special opportunity, their life's achievements would likely end at the Late-stage Qi Refining, making it difficult to even consolidate a Dao Foundation.
Middle Lower aptitude was generally for Four Spirit Roots or Five Spirit Roots Cultivators. Their comprehension was passable, but their absorption and conversion of Spiritual Qi were higher. With the aid of a Foundation Establishment Pill, they had a chance to break through to Foundation Establishment before their vitality began to decline at age sixty.
