After activating the Sentinel Artifact, you need to activate the Pack-a-Punch. To do so, you must localize four pedestals glowing red across the map. Activate them by interacting with them, their locations are the following:
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At the Poop Deck, in the same room as where you just activated the Sentinel Artifact. So easiest to do this one first
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Underwater in the Turbine Room
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By the grand staircase, at the bottom floor
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Underwater in the Cargo Hold
Every time you activated a pedestal, one of the circles on it will emit a blue colour. Once all four have been activated, the pedestal will change in a Pack-a-Punch. Enjoy upgrading your weapons!
