Quote Originally Posted by JerkopusTheFirst View Post
I' ve just started playing like a week ago and I have no idea what the grimoires for the event do, so if anyone can shed some light on that I would be realy grateful
Don't worry about grimoires. They're used to bring your SR/SSR characters to their final limit break, so you can reach max level. They're much easier to obtain in raid events than standard events, so you'll naturally get some as you play this game and participate in the events. For standard events just worry about getting a copy or two of the SSR weapon and the SSR eidolon. They're more important early on.