Arkinslize
As I read somewhere else: "Sometimes, Fate is a B****". I don't understand this hype around her. At some point, even if you want to feel sympathy toward her pitiful state, you can't help but grit your teeth because the plot is so twisted in favor of her survival. But as I would like to find fault with your plot choices, I must admit she deploys passionate conversations, and for this, you won. There is nothing more boring than a character who fits our taste perfectly. But I would add that when a character is too hated or deviate too much, the story also becomes boring. I want to warn you not to stretch this plot too long if you don't want your readers to stop following your story. I'll keep reading for now.
I was happy when the MC gained a class focused on intelligence. Now all my happiness has been drained by this demon called Ruby. How many times is the author going to make Jake a puppy? It doesn't even make sense for him to save her. No matter the low rank, no matter the rewards. Just let her die. If the Oracle is so treacherous, then it's better to join the digesters.