Horror

Number of Sessions 1–2
Exploration Scenes 1 short voyage full of ill omens; 2–4 creepy areas to investigate, like haunted reactors or cursed magitech laboratories
Combat Encounters 2 moderate, 1 severe, possibly 1 extreme. Avoid trivial- and low-threat encounters, except as moments of relief in a longer adventure. Extreme-threat encounters against overwhelming foes are excellent in horror one-shots.
Roleplaying Encounters 2 conversations with doubtful authority figures, 1 opportunity to gather information and rumors, 1 revelation of a horrible truth
Encounter Tropes Surprising and jarring encounters, making it hard for the PCs to feel safe. Encounters that feel overwhelming, even when they're not. Retreat is often the right option (include a reasonable way for the PCs to escape). Environmental storytelling reveals terrible