Night and Light
Nights are genuinely dark, and things come out in them. Light is what makes night and caves explorable.
Every world gets a random day length, somewhere between about 11 and 17 minutes. Nights and caves are dark enough that you need light to get anything done.
What comes out
- Night Stalkers: many-legged things that spit web, fire or stone. Every world has at least one out after dark.
Light
- Torch: cheap, 4 for one piece of wood.
- Ember Torch: burns ore. How bright depends on the ore's Combustion.
- Lantern: steady light for finished builds.
- Torches and lanterns can also go on your back in the pack slot.
Or skip it
A Bed lets you sleep through to morning. On some nights there's a good reason to stay up: an aurora grows Aurora Blooms that are gone by dawn.