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I can't figure out if this is saying to copy everything during the game, or if "ゲーム中に使用する" is describing everything that needs copying?
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Unless the context clearly says otherwise, ゲーム中に modifies 使用する, not 書き写す. That is, 書き写す happens before the game. I'm saying this simply because an adverbial phrase usually modifies the closest verb.
In addition, copy "max HP", "max MP" and "blessing" you use during the game.
(But what's the context? A game master's guide of a tabletop RPG?)