Soul

"Soul?" Renir looked through his memories and found no mention about Souls, neither in the Rune nor the book written by the Last Mage King.

[I am watching you from the start. When you finally reached another stage of enlightenment, you will gain your Soul and that was when I know that I can rely on you. You should know when you received this.]

"Yes..." Renir thought back when he finally understand after Sceke said that he should be selfish since he felt something different at that moment, "But what is this Soul?"