an idea for this game from pso

[Eidolon]

I dont think this is specifically from PSO, I know WoW has rare bosses too, but it would be neat, particularly if they were hiding in some room most people would skip. Might encourage more people to go through every part of the dungeon

With PSO, rare 'bosses' weren't hidden anywhere. You always had the boss at the same point. But the exact example that comes to mind from PSO is when you fight your first boss, De Ragan, who was a fire-type dragon. He could sometimes spawn as an Ice dragon with different loot iirc. It's been a while since I played my little FOnewearl.