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After their Rank Up, both of my siblings Status Updated, their new Classes have changed as well as their abilities. They acquired new Skills too, but the biggest thing was the new Spirit. Spirit Masters can get one new Spirit every Rank, although for me that's two. This means a whole new companion with special abilities that could help them progress.
And the new Spirits of my sibling were within my expectations. Spirits usually follow a pattern. The first Spirit they awaken sets a pattern that every other spirit born after follows. For example, if someone gets a tea bag spirit at the beginning, then the next spirit could be a tea plant monster, a teacup, or a sentient slime made of liquid tea. It has to go around the first spirit's "gimmick".
While analyzing their Status with my Grimoire, I clearly saw their new Spirits appear, even though both of them had no idea it was inside their Spirit Orbs.
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[Name]: [Anna Hunter Goathorn]