A little while back now, I completed some Random Tables that were focused on each of the Monsters listed in B/X and OSE. When I was working on these, I made a quick list of Monsters that appeared in their section, and used this as my baseline, but I had neglected to give a generous gander to those Encounter Tables, leading to a glaring omission: The Rival NPC Adventuring Party.
When these show up in your Dungeons/Adventures it can often lead to surprising situations. On their own they work a little bit like an Opposed or Neutral Faction: Players know that they’re in direct competition for any Glory or Gold that might be found nearby. Sometimes those lovely Rivalries develop, but they can also serve as a way to swell Ranks as erstwhile Allies, or even as a pool of replacement Player Characters if necessary. So here are a Hundred Activities that those Rival Adventuring Parties might find themselves getting up to. As always, strategic substitutions of a few Nouns can make a given entry a bit more bespoken to the given situation.