Here are some of rocks assets I made for the game. A lot of them were used as a "generic" kit throughout the game, for when there is a need to make a rocky environment, but it doesn't necessarily need to have a very specific look.
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Stalagmite assets were sculpted entirely from scratch, rocks and boulders were created by kitbashing cleaned up scans and using them as booleans in Zbrush, flatter walls were made out of cleaned up ice scans from Megascans.