In any public or multiplayer mode. Do you check to see if the person you are with or against on the roster has a higher grimoire than you.
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Just like the other guys are saying, just to check if new or not. Once the grimoire is around 2k or something, you really cant judge anything else from it. Im grinding out the last bits of pvp grimoire. Once i get rumble complete, my grimoire will tell people how much i played and won it. It doesnt tell anyone i hate the gamemode because im really terrible at it.
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I check grimoire on low level people to see if they are actually new so I can offer to help them out. I occasionally look at grimoire on someone that is playing terrible to see if they're new or oblivious. I never use it to judge whether someone is better than me, etc.
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I check for grimoire, but I don't hold people to the same standards as most. I don't feel like a good player has to have a grimoire of 3500+. But that is my two canadian cents. So more like a cent and a half.