To become a master at something, you should dedicate your entire life to it, without any other hobby getting in your way. Kayden was too busy, blinded by the power of stacking concepts, to understand this.
He now had about a century and a few years to live. He spent a lot of time finding his way and now had the same level of power as before, practically back to square one.
A decade later, Kayden felt he made the right choice. He was elevating your specific concepts brought almost twice as much strength as just stacking other concepts. He had no way to test his spiritual sense in that place, but his spells and ease of manipulating mana increased.
The voices continued to speak in his head, becoming more and more present. They grew about the amount of mana the person manipulated and their kingdom. The problem was that Kayden manipulated much more than a normal third-realm person.
