Blood Moon

The Blood Moon is an event that occurs on random midnights in.

Overview
The Blood Moon is indicated by a red-colored full moon rising instead of a regular moon or phase. Before a Blood Moon, the environment will glow red and the air will be full of black particles. When it occurs, the Blood Moon revives all enemies and Overworld Bosses that have been defeated up until that point. The Blood Moon event starts occurring after Link leaves the Great Plateau.

A Blood Moon event can also occur even when skipping time using a Campfire, Cooking Pot, or by sleeping at an inn, as its cutscene still plays after time has been skipped. If a Blood Moon occurs when Link is in a Shrine of Trials or Hyrule Castle, the Blood Moon scene does not appear and previously defeated enemies will not be revived. The Blood Moon will occur every following night until it happens while Link is outside where the scene can appear.

Cooking from 11:30 PM to 12:00 AM on the night of a Blood Moon gives Food an effect boost.

There are two kinds of Blood Moons that occur in the game:
 * Regularly-scheduled Blood Moons happen with the timed phases of the moon and the slow onset between 11:30 PM to 12:00 AM leading up to the event's cut scene, and the world's monsters and world-spawned objects revive to their default state. Additionally, any objects being carried, such as metal objects with the Magnesis rune, do not despawn after the Blood Moon cut scene.
 * Spontaneous Blood Moons can happen at any time with a very rapid onset of only seconds between the appearance of black particles and the transition to the event cut scene. Any objects being carried will also despawn after the cut scene, unlike during a regularly-scheduled Blood Moon.  This has been discovered to occur as a failsafe mechanism within the game engine during times when it is overwhelmed past certain thresholds, such as when it is forced to keep track of too many entities at once.