Alright, I’ve wasted much of today with some thorough testing in solo mode. Following are the steps taken and their result. If anyone wants to include these in their spreadsheets or write-ups as what NOT to try, so other people don’t waste their time on this, feel free.
1. I’ve attempted to see if additional obelisks would turn on, when two standard obelisks are scanned in sequence. Now, I understand there are a gazillion combinations, considering the number of artifacts and obelisks, so I simply used the correct one of the primary artifacts (casket, urn, orb, tablet, totem) on the corresponding obelisk (i.e. casket for obelisk 1, tablet for 11, a.s.o.)
I’ve only tried this with obelisk number 5 (solo map, next to beacon on top of big circle) as the starting point…, scanned obelisk 5 with casket in hold (no error message), then switched to correlating artifact for obelisk 1 and scanned again (no error message). After that, I checked all obelisks if an additional one lit up. Once check was negative I reset instance and started over with obelisk 5 and then obelisk 2… after that 5 and 3, and so on. All results are negative, which means that
a. Either there’s no sequence to turn on additional obelisks
b. There is a sequence, but it has to be started at the correct obelisk
c. There’s a sequence, but it triggers after more than two matches
Conclusion: If FDev really implemented sequenced scanning without visual cues, then good luck ever getting the right combo.
2. I’ve also timed the pulsating glow of all 15 standard obelisks with any artifact, meaning I loaded one of each artifact into the cargo hold, targeted the obelisk in proximity of 10m or below, and timed the light pulse. The pulse never changed, it is constant at around 5 seconds on, then dims and pulses again. I’ve also checked it with the correct item combo per obelisk… no change.
Conclusion: Once again, no visual cues on the obelisks as to what combo is in proximity (at least not in solo)
3. I’ve removed all artifacts from the ground glow locations to see if anything would change throughout the ruins… no change.
Conclusion: The artifacts original locations do not seem to have an impact on the puzzle (at least not in solo)
Summary: The consensus seems to be right now, that the mission is not solvable in solo mode, which I find extremely disappointing, but what irks me more, is that FDev seems to confuse tedious chores with intriguing puzzles and gameplay.