Sides¶
Every combat encounter is a conflict between two sides. The heroes and any of their allies are one side, controlled by the players. Any creatures who oppose the heroes are the other side, controlled by the Director. All creatures who oppose the heroes are on the same side, even if those creatures also oppose each other. For example, if the heroes are battling a group of bandits when a kingfissure worm suddenly bursts into the fray to devour player characters and brigands alike, the worm is still on the side of the bandits for the purpose of the game's combat rules.
NPC Allies
If an NPC ally fights alongside the heroes, the Director should give the players the ally's stat block and let them control the NPC during combat. The Director has enough to worry about. As well, any missteps, mistakes, or triumphs the ally makes will be thanks to the decisions of the players and not the Director, which can make the outcome of the battle more satisfying for the players.