Can this get me struck down or in trouble?

I am writing my own book, and I wanted to know if I can use items from games and movies in said book. Ex. I wanted to put a monster from the game Dauntless into my book. I m just worried that I ll find out too late that I can get in trouble for this kind of thing. This might be a simple question to answer, but I m... show more I am writing my own book, and I wanted to know if I can use items from games and movies in said book. Ex. I wanted to put a monster from the game Dauntless into my book. I m just worried that I ll find out too late that I can get in trouble for this kind of thing. This might be a simple question to answer, but I m 15, with very little knowledge on the legal system
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