The Songstress heritage is the same, if one wants to reach the realm of [Songstress Heritage Lv.9] (Legendary), it's not enough to simply become a Color Level Songstress, one must also have at least the strength of Rank 8 in the Sequence.
For Transcendent beings, their strength mainly comprises three parts: 'Talent,' 'Ability,' and 'Skill.' Among these, 'Talent' is inherent and can't be changed, 'Ability' is the result of the combined effects of Talent and the Transcendent Profession, and 'Skill' can be taught to others; as long as the conditions are met, anyone can learn and master them.
As to why Hexia could study two different Sequences at the same time, this was a power she had only recently discovered, probably related to her Mythical Level Talent, meaning she could momentarily perform a spacetime swap of her Transcendent Core.
