Here is a conversation between Brakos and Jackson explaining how spirits gain power and how some of their powers work.
I wrote this to be added to a chapter but couldn't find anywhere to add it so I am just going to post it instead. you can think of it as a conversation they had outside of the main chapters. Enjoy.
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"I should explain a bit about myself and a little bit of how Etherials gain power." brakos said
"Every Etherial has a power associated with them. Those who are associated with an act or emotion will gain power by doing the said act or causing other people to feel said emotion. For example, a demon of lust will gain power by sleeping with mortal races or making others lust over the demon, and no they can't gain power from other Etherials."
"For an Etherial that is associated with an element will be limited by how much of that element is around. For example, a spirit of water will be powerful in the middle of the ocean but almost powerless in the middle of the desert. There are other factors but you can understand the basics.
I nodded with that as I could understand "So it's just you gain more power the more you interact with your associated power."
"Pretty much." brakos shrugged his shoulders and smiled. Seeing I was adjusting to the large amount of information seemed to put him at ease. "Now some more powerful Etherials, like myself, will have a Title. They grant us power based on said title. My title is The Primordial Spirit Of Time, Stories and Knowledge, For me, I have 3 titles, the first being a spirit of time means I can control time to a certain extent and I gain power the older I become. Normally a spirit of time would have to learn about time magic and use it to gain power, the reason I gain power simply by existence is because I am a primordial, I existed since the beginning of time itself."
"The second is Stories, this ties into the library a little bit. I have access to every story out there in the multiverse and I grant people the inspiration they need to create a grand story or live a life of adventure. I don't gain power from this instead I use what I have learned or seen from other stories and grant them inspiration or use it myself."
"For the last, knowledge, it is the library itself it is my domain and my soul incarnate. I do not gain power when people learn something new instead I grant people knowledge and if a new law of the world or something large previously unknown thing is discovered then It will be documented here and I gain power."