Blood Moon



"The Blood Moon is rising..." A Blood Moon is a common randomly occurring event that takes place over the course of an entire night. It causes several hazards for its duration: Enemy spawns increase, even near the player's Home and NPCs (where enemies do not normally spawn), Zombies become able to open Doors, and Bunnies, Penguins, and Goldfish transform into dangerous enemies, along with other effects (see below). Blood Moons are signaled by the message "The Blood Moon is rising..." in the lower left corner of the screen, and the moon, sky, water, and rain will appear red for the duration of the event. A reddish-pink filter will also be present in all above-ground areas.

A Blood Moon will only occur if at least one player in the world has more than 120 life, and only on nights when a moon is present (any night except a new moon). Given those criteria, a Blood Moon has a 1 in 9 (11.11%) chance of occurring.

Enemies

 * The spawn rate of enemies on the surface increases., , The Groom, , and the Clown (if in Hardmode) have a chance to spawn. Enemies not only spawn faster, but more are spawned than can normally exist on-screen at once. This works no matter the environment, so Corruption and Crimson enemies can also swarm even more than they normally would, for example.
 * Enemies can even spawn near NPCs and their houses, whereas those usually suppress enemy spawns. Player-placed walls are not necessarily safe during this event.
 * Zombies and their counterparts can open Doors.
 * Goldfish become Corrupt Goldfish/, Bunnies become Corrupt Bunnies/, and Penguins become Corrupt Penguins/. Those spawned from Statues are Corrupt/Crimtane or Vicious, and they do not revert to regular Goldfish or Bunnies after the Blood Moon is over. If it is raining during the event, transformed Goldfish will flop around on the ground, rather than walk.

Sold items

 * The Merchant sells Throwing Knives.
 * On the, the Merchant always sells Throwing Knives. He sells Poisoned Knives exclusively during a Blood Moon, instead.
 * The Arms Dealer sells Silver Bullets (Pre-Hardmode. In Hardmode, the Arms Dealer will always sell Silver Bullets).
 * The Clothier sells the Mime Mask, and.
 * On the, he will also sell George's Tuxedo for male players, and the Fabulous Outfit for female players.
 * The Dryad stops selling Purification Powder, Sunflowers, and Grass Seeds.
 * If the Corruption is present, she will sell Vile Powder and Corrupt Seeds.
 * If the Crimson is present, she will sell and Crimson Seeds.
 * On the, she will also sell Sparkly Wings during Hardmode.
 * The Painter sells the Evil Presence painting.
 * The Steampunker sells Purple Solution if the Corruption is present, or Red Solution if the Crimson is present instead of Green Solution.
 * The Cyborg sells Rocket II ammunition.
 * The Skeleton Merchant sells the during Hardmode.

Other effects

 * Deathweed blooms. Blood moons (and Full Moons on ) are the only times you can harvest Deathweed Seeds from Deathweed (with the exception of harvesting with a Staff of Regrowth).
 * Most NPCs have their own unique lines commenting on the event. All female NPCs except for the Party Girl act annoyed or rude.
 * As said before, water will turn red, including Rain. A red filter will be applied to the screen as well, shifting the colors of all entities and light towards red and purple shades. This will also affect the projectile colors of many weapons.

Tips

 * During a Blood Moon in Hardmode, every enemy has a 1 in 1000 (0.1%) chance of dropping the KO Cannon.
 * Simply placing a block in front of a door will prevent Zombies from being able to open the door.
 * If you see the notification that a Blood Moon is rising, get underground as quickly as possible. Going indoors will not save you. Neither will standing around outside. The Blood Moon gives enemies dangerous abilities, such as the ability to open doors or the ability to spawn within player-placed walls.
 * Although the Blood Moon is typically treated as a deadly event, it is possible to enjoy the event. Once you've got max health and good weapons and armor, the new enemies are not a serious threat, especially if you've prepared your base. As the Tavernkeep says, "You know, where I'm from, a Blood Moon is actually just an excuse to get some fresh air."
 * Note that the increased spawn rate applies even underground, which may be useful, e.g. if you're farming enemies for a drop.

Trivia

 * In real life, the Moon appears red during s, and is sometimes referred to as a "Blood Moon". As sunlight passes into the shadow through the atmosphere, the Moon is given a red/orange color due to the amount of air the light passes through. This is the same phenomenon that gives sunsets and sunrises such colors.
 * When a real Blood Moon occurred on April 14, 2014, a warning was jokingly announced on the official Terraria forums.
 * During a Blood Moon, most female NPCs use more irritable or aggressive dialogue than normal. This is a reference to the fact that some women in real life become irritable or aggressive due to, as both the and the Moon cycle occur approximately every 28 days.

History
Blutmond Lune de Sang 블러드 문 Krwawy Księżyc Blood Moon Кровавая луна 血月