Anti-Magic grimoire
One of the two rarest grimoire outcomes named by the official game description.
Confirmed progression
Like every grimoire described by the developers, this book levels through combat and gains new spells at book levels 10 and 20. You keep the same book for those unlocks.
What the tier means
This site ranks Anti-Magic by its official availability group, not an invented damage score. Public material does not provide a verified roll probability.