You will need a crossbow to obtain this treasure. In the Library, there is a hidden switch on the right hand side of the lower level, left bookcase. Pull that switch (watch out for falling books!) and a passage will open up on the upper level bookcase. You can either dispatch the henchman with your bow and arrow or just dodge his swings and dash into the entryway.
Jurassic World: Dominion Dominates Fandom Wikis - The Loop
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