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:
At the Poop Deck, in the same room as where you just activated the Sentinel Artifact. So easiest to do this one first
Underwater in the Turbine Room
By the grand staircase, at the bottom floor
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!
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