Board Thread:Questions and Answers/@comment-2607:FEA8:BD1F:F401:F5E8:BAB1:DD89:27AB-20190925005334/@comment-43394466-20190925013752

Depends on the run. I was able to cross the 30, 30, 29 milestone without them open but they sure as hell would have helped. And of course there is no way to stop the Erosia Tanurak stirke and Erosia suffering that comes from it if you don't open the ruins.