Blood Moon

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BiomeBannerBloodMoon.png
“

You can tell a Blood Moon is out when the sky turns red. There is something about it that causes monsters to swarm.

— The Guide

 "The Blood Moon is rising..." 

A Blood Moon is an event that takes place over the course of an entire night, from 7:30 PM to 4:30 AM, affecting only the surface layer.

Blood Moons are signaled by the status message "The Blood Moon is rising...". All the water in the world, even underground, will turn blood-red for the duration of the event, including rain and the moon itself. (Desktop, Console and Mobile versions) A red filter will be applied to the screen when the player is on the surface layer.

The event will bring new and dangerous enemies, while also changing their behaviour and spawning conditions (see below).

(Desktop, Console and Mobile versions) During a Blood Moon, the ability to speed up time whilst sleeping in a bed is disabled. Also, the player's Fishing Power is increased by 1.1 times. However, fishing could also bring about unique enemies.

Criteria

In order for a Blood Moon to naturally occur, the following criteria must be met[1]:

  • It will only occur if at least one player in the world has more than 120 health.
  • It can only occur on nights when the moon phase is not new moon.
  • It will not occur if the Eye of Cthulhu will spawn on that night.
    • Given those criteria, a Blood Moon has a 1/9 (11.11%) chance of occurring.

(Desktop, Console and Mobile versions) A Blood Moon can be initiated manually at night by using a Bloody Tear, and does not require said criteria to be met.

Whether a Blood Moon will occur naturally is determined at dusk each night. Every nightfall has an equal chance of being a Blood Moon and does not change if the previous night was a Blood Moon. It is possible to have four or more Blood Moons in a row and, conversely, a Blood Moon will not necessarily occur even over the course of many in-game weeks.

Contents

Characters
Anytime:
On a Corruption world:
On a Crimson world:
From Fishing:
During Hardmode:
From Fishing during Hardmode:
Unique Drops
From Corrupt Bunnies and Vicious Bunnies:
From Corrupt Penguins and Vicious Penguins:
From Corrupt Bunnies during Windy Days:
From Vicious Bunnies during Windy Days:
From The Groom:
From any Enemy or NPC (Dropped in Hardmode only):
From Dreadnautilus(Desktop, Console and Mobile versions):
From Hemogoblin Shark(Desktop, Console and Mobile versions):
From Blood Eel(Desktop, Console and Mobile versions):
From The Bride(Desktop, Console and Mobile versions):
From any Blood Moon Enemy:
From any Blood Moon Enemy caught during fishing:
From Hemogoblin Shark(Desktop, Console and Mobile versions) & Blood Eel(Desktop, Console and Mobile versions):
From Wandering Eye Fish(Desktop, Console and Mobile versions) & Zombie Merman(Desktop, Console and Mobile versions):
From Drippler(Desktop, Console and Mobile versions) & Blood Zombie(Desktop, Console and Mobile versions):
From Clown (In Hardmode only):
From Vegetation:
From Fishing:
For Sale
From Clothier:
From Zoologist:
From Dryad:
From Arms Dealer:
From Dye Trader:
From Cyborg:
From Merchant:
From Painter:
From Steampunker:
From Skeleton Merchant(Desktop, Console and Mobile versions):
Music

Effects

Red rain during a Blood Moon

Enemies

  • The spawn rate of enemies on the surface increases. Not only do they spawn faster, but more are spawned than can normally exist on-screen at once.
    • This works no matter the environment, so for example Corruption and Crimson enemies can swarm more than they normally would.
    • It only affects spawn rates above the surface. Spawn rates below the surface remain the same.[2]
  • Enemies can spawn near towns, even though those normally suppress enemy spawns.
  • Zombies and their counterparts become able to open Doors.
  • Goldfish, Bunnies, and Penguins turn into Corrupt Goldfish/Vicious Goldfish(Desktop, Console and Mobile versions), Corrupt Bunnies/Vicious Bunnies(Desktop, Console and Mobile versions), and Corrupt Penguins/Vicious Penguins(Desktop, Console and Mobile versions) respectively.
    • Those spawned from Statues will also become Corrupt/Vicious (Desktop, Console and Mobile versions), and do not revert to their regular forms after the Blood Moon is over. If it is raining during the event, transformed Goldfish will flop around on the ground, instead of walking.

Other effects

Visual effects

  • (Desktop, Console and Mobile versions) A red filter will be applied to the screen, shifting the colours of all entities and light towards red and purple shades.
  • Almost all water will turn red, including rain.
    • The Oceans will not turn red, though it will be affected by the screen filter.
  • The filter will also alter the projectile colours of many weapons.
  • Placed Living Cursed Fire Blocks turn yellow, creating a unique effect.
  • The Glowing Mushroom Biome, which is normally blue, will appear pink-purple because of the red shader.

Achievements

Achievement Bloodbath.png
Bloodbath • “Survive a blood moon, a nocturnal event where the rivers run red and monsters swarm aplenty.”
Survive your first Blood Moon. (Desktop, Console and Mobile versions)
Category: Explorer Explorer
Achievement Red Moon Rises.png
Red Moon Rises • “You have survived the Blood Moon!”
Survive your first Blood Moon. (Old-gen console version)

Notes

  • The Blood Moon's effects on enemy spawn rates stack with that of the Water Candle and Battle Potion.
  • In a multiplayer game, using the time adjustment server commands (dawn, noon, dusk, midnight) will not trigger the Blood Moon check, and so using "dusk" repeatedly does not force a Blood Moon to occur.
  • If a player chooses to, they can cancel a Blood Moon by summoning the Pumpkin Moon or Frost Moon.
  • A Blood Moon can happen in the middle of a Pirate Invasion. The invasion will still go on until it ends, then the Blood Moon starts.
  • Blood Moons occur more often than Solar Eclipses, as Solar Eclipses have a 1/20 (5%) chance to happen each day (when the criteria are met).
  • If a Blood Moon and Full Moon coincide, Werewolves will spawn with increased frequency, instead of Zombies. Other spawns won't be affected.
  • Similar to the Solar Eclipse, a Blood Moon will increase the spawn rate of Truffle Worms once in Hardmode.

Tips

For more elaborate strategies on defeating Blood Moon, including weapon and arena recommendations, see Guide:Defending against events.
  • During a Blood Moon in Hardmode, every enemy and NPC has a 1/1000 (0.1%) chance of dropping the KO Cannon. This means that even though it is rare, like with the Blessed Apple, the large number of drop chances makes this easier to farm, and the KO Cannon is likely to aid a player in early Hardmode.
  • Simply placing a block in front of a door will prevent Zombies from being able to open the door.
  • If the player sees the notification that a Blood Moon is rising and they are under-equipped to defeat it, they should get underground as quickly as possible. Going indoors will not save them, nor will standing around outside. The Blood Moon gives enemies dangerous abilities, and there will be much more of them.
  • Although the Blood Moon is typically treated as a deadly event, it is possible to enjoy the event. Once the player has max health and good weapons and armour, the new enemies are not a serious threat, especially if they have prepared their base. As the Tavernkeep says, "You know, where I'm from, a Blood Moon is actually just an excuse to get some fresh air."
  • (Desktop, Console and Mobile versions)The Blood Moon is a great place to use weapons with the Cursed Inferno debuff. It does significantly increase damage since 1.4.1, and most Blood Moon enemies are fast, meaning you'll be dodging a lot more than in regular gameplay, and making Cursed Inferno (with its damage over time) much more useful.

Trivia

  • In real life, the Moon appears red during a lunar eclipse, which is sometimes referred to as a "Blood Moon". As sunlight passes into the shadow through the atmosphere, the Moon is given a red/orange colour due to the amount of air the light passes through. This is the same phenomenon that gives sunsets and sunrises their colours.
  • When a real Blood Moon occurred on April 14, 2014, a warning was jokingly announced on the official Terraria forums.[3]
  • During a Blood Moon, all female NPCs except the Party Girl and the Desktop versionPrincess 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 premenstrual syndrome. Both the menstrual cycle and the real-world Moon cycle occur approximately every 28 days.
    • Female player characters are not subject to such changes - all dialogue between the player and NPCs is as normal for Blood Moons, and the player is not implied through the NPCs to appear more irritable.

History

  • Desktop 1.1: The chance of a Blood Moon was decreased to 1/9 from its previous chance of 1/7.

References

  1. ↑ Information taken from the Desktop version Desktop 1.4.3.6 source code, method UpdateTime_StartNight() in Terraria.Main.cs. There may be inaccuracies, as the current Desktop version Desktop version is 1.4.4.9.
  2. ↑ Information taken from the Desktop version Desktop 1.4.0.5 source code, method SpawnNPC() in Terraria.NPC.cs. There may be inaccuracies, as the current Desktop version Desktop version is 1.4.4.9.
  3. ↑ www.terrariaonline.com → Forums → News → Dev Blog → thread: The Blood Moon is Rising...
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