Surviving the park in Grounded 2 is surprisingly hard, with new gear being few and far between in the early hours. Beat The Art of War mission, though, and you'll unlock the smithing station for armour and weapon upgrades. To construct the smithing station, and for the subsequent gear upgrades you'll undoubtedly want, you'll need brittle whetstones and brittle plating.
If you explored the scorpion cave in The Art of War mission well enough, then you'll have already found enough brittle plating to craft the smithing station (though with none to spare for armour upgrades). Weapon-upgrade whetstones, however, are much harder to find.
