I know there are many guides / farming areas online but many of them are outdated and were created before Bungie made majors count towards it as well.
I know of The Eye of a Gate Lord and The Black Garden. Does anyone else have any more efficient methods?
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The first part of the regular undying mind strike...just play it until after you clear the first part, leave and start it again, I think each time nets 4-5 hydras...
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Start up the Undying Mind solo. Kill the waves until about 5 Hydras spawn. Kill, wipe and repeat.