I finished the campaign solo, and got my first Harbinger in Last Ruin. Did a few more, up to 4th Harbinger quest.
Levelled alt with my wife. We did Spirits of Fire last, and she got her first Harbinger. When we defeated it, we both got the blessing. However, since I am up to part 4 of the chain, my ‘quest’ is different to hers, so I never got compeltion for Spirits of Fire. I need to do it again now.
All players should get flagged for completion, even if they have different Harbinger progress.
I completed Spirits of Fire solo. I was confused when a Harbinger spawned after killing the timeline boss. I thought maybe I had bugged the timeline out, and would never get credit and hence never get empowered monoliths.
Instead, killing the Harbinger gave me credit for Harbingers of Ruin: Part 4. This was a non-empowered Spirits of Fire with 0 Corruption, a far cry from the 150 needed. Forgotten Knight talked to me, Pen was there, up to Part 5 now. Odd. Also, it did unlock the empowered timelines. That’s nice. Best outcome I guess.