Are named bosses totally random, or is there some kind of formula to follow when looking for them? I've heard that they have a higher chance of spawning if there's more people currently in the dolmen, but I have no idea if that's true. And if it is, would that count for any time prior to the boss dropping? And what are the numbers that effect it?
Also, I'd heard both that there's a named boss specific to each dolmen, and also that any could show up at any given time at any dolmen.
I've just gotten a lot of conflicting information. So I'm curious if anyone actually knows/has experienced anything that could set some records straight.