WalterKovacs
First Post
And it depends on how you look at the plot. Many D&D scenarios tend to favour the '24' style when it comes to villains - the initial apparent big bad falls partway through the story, to reveal another behind him, who reveals another behind him, etc. We even have candidates available, in the form of the Fiendish Trio and the Snarl.
However that sort of plot is necessary as the PCs level and defeat the 'boss' monsters. In Xykon's case, he's so far ahead of the Order that he barely recognises them as threats, let alones remembers them when he runs into them again. Any victories they achieve over him will be tactical ones, such as preventing him from gaining access to the gates and the like.
The Snarl, the Linear Guild, the Fiendish Trio, and even Red Cloak are all 'other villains' that the Order can deal with, but it doesn't necesarrilly mean that they can't fight anyone but Xykon until he's defeated, it would be a long time before the party would be able to 'catch up' to him level wise.