In Pt 17, I had to find out the hard way how to backtrack to get the mural in the bottom far left of Flooded Archives by doing a chapter replay to see where the cave entrance was. ***IMPORTANT TIP*** If you also missed this mural because its a real PAIN then you can re-enter the cave by fast travelling to the Ridgeline Base Camp in Geothermal Valley crossing the rocks across the river then just keep taking that pathway til you come to the same cave you came out of after you finish Flooded Archives. But you WILL need the Broadhead climbing arrows.
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