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Title, basically. In Draconis Mons, near first heart (Tactician Tunelle one), there is a Loose Rock "node" that can be used to create Rock bundle. As far as I know it's the only one on the map, and probably the game, so it's probably safe to assume that it is tied to a secret achievement. I tried throwing it on some random things, but haven't found any particular use. Anyone had more luck?

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over 7 years ago - /u/Anet-TylerB - Direct link

When I first designed the suspicious bushes task, you couldn't [F] interact with the suspicious bushes, instead you had to throw a rock into them. The logic was that it'd be a lot safer to check out a potentially dangerous bush by throwing a rock into it, rather than sticking your face into it. However, the early playtesters were confused by this mechanic, so I re-enabled the [F] interact, and decided to leave the 'loose rocks' in as a minor easter egg.