I try not to post in general discussion any more since I feel it's a bit of an echo chamber in here but I wanted to share some info from the Pagos discord who have been recording and monitoring data regarding FATE spawns.
It seems that instances are "recycled" a few times. This means, if you arrive in a "fresh" instance as the first group with no one else in there - there's a possibility that instance is not fresh at all. This means, any work done by the previous players in this instance before, carries over to the "new" recycled instance.
Including fate pops.
It is 100% possible for you to spend a 3 hour lock out fighting the same mob in an attempt to spawn a fate (usually the higher level ones like Louhi, Cassie, Behemoth) but the fate will not pop due until the instance recycles - which you may or may not be able to get back into. I'm unsure of the cool down between recycled instances.
Example:
I have seen this myself in "fresh" instances where randomly the snowman or hakutaku fates will pop but no one was there. We've farmed corpses at night in an attempt to spawn Louhi, failed during our timer and had it spawn for the next people after us, leading us to spam the duty finder like crazy trying to get back in.
Another example with the copy cat cassie fate. A fresh instance where the previous entire instance had timed out, the instance then recycled and Cassie spawned on blizzard:
The reason I'm incredibly angry that this is a possibility is because my group and I set alarms to wake up for a specific weather, got up and farmed four hundred and two morbals in an attempt to spawn Copycat Cassie. The current theory is that blizzard weather is a key since thats how we popped her last time so we tried to copy what we'd done before. Not only is this amount of grinding extremely excessive for "casual" content (assuming we are correct in the proper spawn conditions, of course) the real kick in the teeth is realizing that our work could just be recycled for other people. (That, and the earrings drop from Cassie seems to be ONE total for everyone who is fighting in the fate. Exactly the same as Diadem's EM weapon drop.)
After farming, no pop, the instance was not refreshing ( I think they lock off, go on cool down and then get recycled) and we could not get back in to see. All those mobs work, for nothing.
TLDR: What does this mean?
- It's possible your "fresh" instance is not fresh at all and you are completely at the mercy of the groups before you before the instance reset. Tracking NMs is therefore pointless because you do not have the data from the previous group if it's a "fresh" recycle. The only thing you can know is what is down from your own time in there, not what is up.
- You could spend 3 nights farming corpses to spawn Louhi, but it's possible he's on CD from the instance before, even if you thought you were in a "fresh" instance.
- You could spend 3 nights farming corpses to spawn Louhi, have your timer time out and the group after you will get the fate pop.
Have fun, everyone.