You need to combine 4 green ones into 1 blue stem, once you have that blue stem you must find it's resonance node on mars or else you won't be allowed to recombine green ones into a blue one, that may be where youre stuck at.
Use this to find them ingame
[spoiler]https://docs.google.com/spreadsheets/d/10OS_e1WbzvlbmpQ6hFsYlhlFMeJP-1bwdZTmlvJLQWQ/htmlview[/spoiler]
remember you can only hold 1 blue at once, if you don't go find it you'll be stuck there(cause i don't think you can discard it)
Hope this is somehow related to your issue.
English
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In most cases you don’t get a stem for the area you are in when you combine it. Like if you make it in Futurescape it’s unlikely to give you a futurescape key. So if you’re trying to get all 45, combining them in the tower can often make it easier to get ones you haven’t got. That’s how I managed to get my final few after about 20 duplicates. Find a checklist you can tick off to avoid you chasing down duplicates.
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Having 45 nodes? What does that unlock?
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Just a triumph I believe. I think that’s all. Maybe something else after doing 30 (sleeper only needs 15)
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Sorry it’s just 40. 45 is the data fragments.
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i had to complete a step in the nescent quest to get it back thanks though!