Ragnar looked at his stat board. During his previous life, he had come across the theory. Mana was just a form of energy humans were most proficient in harnessing and using for their needs. there were other forms of energy as well. There was even a clear difference and distinction between each kind. During his research, he came across a lot of kinds. Demonic energy, Holy energy, Qi, Mana, and Soul energy (the one he used to train his souls), among others. There was also superiority among teh energies. Mana can't be compared to Demonic Qi, just like it wasn't compatible with divine energy.
"There should be more to it?" Ragnar asked.