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The grimoire contains many sealed entities, and there is a ranking system for them. In order to seal an entity, one needs to weaken them first through physcial means or through spells.
S Rank - Unknown, the pages about them are black with a single signature at the center. There are a total of three S-rank entities, all of them are sealed by Selene. To unseal, it requires the current Knight of the grimoire and Selene. Selene warned Knights against opening the pages containing the ▇▇▇▇, because even in their sealed state, the mere act of opening their pages risked inviting disaster, not only for the Knight but for the world around them.
A Rank - Has great control of their forms and can mask their malicious intent, even blending in human society. If they cannot be granted passage, then they must be sealed. There are tons of A-rank entities sealed in the grimoire, because some of them require a specific way to weaken them.
B Rank - Some have physical forms. They can range from vengeful spirits or beasts that hunt humans. Binding and granting passage is the standard procedure, because sealing them isn’t really necessary.
C Rank - They don’t have physical forms. They’re mischievous, and usually mean no harm. Talking scolding to them straightens them out.
D Rank - Non-malicious entities. Best to not bother them, these are entities who want to be left alone and live peaceful lives.
Code by Kevindish