It's quite easy if you know how to do it. First, get a decent megalosaurus or spino (I used a wild tamed meg with 382% damage), you can easily get to the trench from the element falls. Then, pick ONE egg that you are targeting. Kill the rock drakes around it. Make Zipline paths to that one nest and grab the egg. Zipline back to your mount and run. If a rock drake attacks you before you are on the zipline, use an apprentice or higher shotgun to kill it. Good luck survivor! Enjoy your rock drake!

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