In Grimoires Era, Grimoires are the unique movesets players can use in combat. At the moment of writing, there are 10 Grimoires, so it might be really hard to choose the best one if you're a newbie.
Instead of relying on microtransactions, you can redeem the latest codes to get Aura Spins, Grimoire Spins, and several boosts in Grimoires Era. These ensure a perfect start to your adventure.