There should be other ways to obtain the Field notes.

[Vahlnir]

I'm about that number of runs and i haven't got any drop for lyon or menenius.

I noticed in my last run today 2 people from my party leaving before last boss. This is very worrying and i hope the note farming will not develop into that. There is still people new to the instance and beside the frustration i have every time i open the Lyon chest i do enjoy the complete run. Unsure what my feeling will be in 5 months time and still no note tho because yea, bad luck is a thing that can stick to you for a long time (looking at my over 100 The Ghimlyt Dark run before the TT card finally dropped)

I'm closing in on 20 Castrums so far and I just completed my 10th Dalriada run last night. Nothing from Lyon in Castrum, but I did manage to get the Menenius notes from Dalriada on I think my 8th run. I feel fortunate to have been THAT lucky, but Lyon's Castrum drop feels like it will forever elude me. I've settled on one run a day for each place. Hopefully it will happen eventually. lol

[Driavna]

I'm closing in on 20 Castrums so far and I just completed my 10th Dalriada run last night. Nothing from Lyon in Castrum, but I did manage to get the Menenius notes from Dalriada on I think my 8th run. I feel fortunate to have been THAT lucky, but Lyon's Castrum drop feels like it will forever elude me. I've settled on one run a day for each place. Hopefully it will happen eventually. lol

Sucks that is something out of your control and I hope at some point SE put a fail safe, all I can tell is that eventually stuff drop. Hope you get lucky soon.