Going All Out!
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The Soul Grimoire is an evolution of my own Soul Book which surged because of my Unique Skill [System] because the System I have merged with my Soul Book, and after evolving a couple of times, my own soul went through an evolution. At the end, the Soul Book everybody has ended mutating and evolving into a Soul Grimoire, which had many new functions. I could accumulate System Points by sacrificing some EXP and Skill Proficiency to buy new Skills, or even level them up too. With these points, I can also modify the units that appear inside my Soul Grimoire, such as all my allies that appear as cards. I can even summon new Undead and create them through the Soul Grimoire, although I need materials that often appear listed in the book as well.