Obtaining Sample NES006 grants an upgrade that adds High Value Targets to specific spots in each Echoes Battlegrounds activity.
Taking out an HVT gives a chance to receive an Assimilated Beacon upon activity completion.
Plugging a Beacon into a Vex Construct in the location listed in the item description starts a fight which, upon completion, can award a 400g Radiolite sample.
For what it’s worth, after having gotten a rare sample using the above procedure I have colllected 400g Ruby, Sapphire, Ivory and Gold samples.
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This worked for me, I was able to get the last 400g sample I needed off of it. Really enjoyed the secret nature of it and a way to guarantee the drop as well without it feeling like a handout.