[2020] We are now 3 weeks into 3.10 and there is still a lot of people who CAN'T HAVE THE MASTERS MISSIONS randomly spawn on maps if they don't play their first character of the League.

We've spent a tonne of time investigating this. We tried to reproduce it internally and weren't able to. We scoured the code and found no issues. Earlier this week I asked people who were experiencing this to send me their accounts so that we could look at their specific cases to see if something unusual was happening. In two of those cases, the players messaged me afterwards to say that they'd found those masters since. In all of those cases, we tested dozens of maps on their accounts and found that all masters had spawned.

Right now one of our sys-admins is working on a script to scan the instance logs of these accounts so that we can see exactly how many masters have spawned for them and which ones. This is taking a while so it's unlikely we'll see results until early Monday.

The rate that masters appear naturally in maps is 10% and therefore 2% per master. Maps are also limited to one master at a time. This means that if you're forcing masters to spawn through the use of Atlas missions, Sextants or Prophecies, a master will not be able to spawn naturally for that given map. (Cassia and Tane are not masters.) This means that if you're not forcing masters to spawn at all and you run say 50 maps, you might only see each master once or perhaps more or less based on your luck.

It's possible that they are simply rarer than people expect but I'm hoping the results from the logs on Monday can help shine more light on the situation because it's definitely a concern that so many people are reporting this. I'll follow up on Monday and let you know the results as soon as I can.

Yeah, I can't confirm that but it would definitely be worth raising the question.

Cassia isn’t a master. She has a 10% chance to spawn so she is five times more likely to spawn than any specific master. She can also spawn alongside masters.

There's around a 35-45% chance to get a master mission when you complete a map which means it should be the main source of master missions over masters spawning in the wild. Blight (Cassia), Legion and Abyss each have a 10% chance to spawn in maps and can spawn alongside each other (and alongside masters) so they will be relatively common. You have a 10% chance to spawn a master in the wild if your map does not have a master through the use of Atlas missions, Sextants or Propechies. These systems do not interact with each other so you're not more or less likely to see a master because you've seen Blight, Abyss or Legion.

Cassia and Tane are not masters.

I don't have any major news about this yet. We are still getting more data so that we can be really comprehensive but so far we haven't found a single case where players weren't able to spawn masters, the outlying cases where no masters have spawned naturally have been when players have run fewer than 20 maps and it's likely to just be bad luck in those instances. We'd still prefer to analyse a larger sample size before saying anything definitively so we'll do that this evening and in the morning and then I hope I can say something about it again.