Nanite provides highly-detailed architectural geometry. Specifically, buildings are rendered from millions of polygons in real time, and each brick, stone, wood plank, and wall trim is modeled.
Natural landscapes are highly-detailed too. Individual trees have around 300,000 polygons, and each stone, flower, and blade of grass is modeled.
Lumen reflections provide high-quality ray traced reflections on glossy materials and water.
Also, Lumen provides real-time global illumination at 60 FPS. You'll see beautiful interior spaces with bounce lighting, plus characters reacting to the lighting of their surroundings. (For example, red rugs may bounce red light onto your Outfit.) Also, Outfits that have emissive (a.k.a. glowing) qualities will scatter light on nearby objects and surfaces.
Virtual Shadow Maps allow for highly detailed shadowing. Each brick, leaf, and modeled detail will cast a shadow, and character self-shadowing is extremely accurate. This means that things like hats and other small details on characters will also cast shadows.
Temporal Super Resolution is an upgrade over Temporal Anti-Aliasing in Fortnite, and allows for high-quality visuals at a high framerate.
