Between combining skills and creating advantages for teamwork (page XX), a group of PCs can really overwhelm a single opponent. This is fine if you want to respect the advantage of numbers, but not great if you want to present a “big bad” that’s the equal of the whole group.

But remember, for monsters and other big threats it’s acceptable to break the rules (page XX)—so do so by looking at ways to counteract the group’s usual advantage of numbers, while still giving them a chance. Here are a few suggestions for ways you might do that. You can use one or more of these in combination for especially difficult or terrifying final bosses.