Talk:Blood Moon

Blood Moons on a new moon?
I could be wrong but it looks like Blood Moons can't happen during a new moon and the chance is 1 in 7. if ((!WorldGen.spawnEye && (moonPhase != 4)) && ((rand.Next(7) == 0) && (netMode != 1))) Has anybody seen one happen on a new moon? Olrad 16:06, 27 June 2011 (UTC)
 * I believe rand.Next(7) would produce a random number from 0 to 7? That'd still be 1 in 8 chance. Also, possible confirmation on the !WorldGen.spawnEye part; I went somewhere well in excess of 70 days without a blood moon, but the night immediately following my killing the Eye, I got a Blood Moon. ... Also the next night, and a few since. 67.183.13.118 23:51, 9 July 2011 (UTC)
 * the rand.Next(n) function returns an integer from 0 to n-1 --GauHelldragon2 03:10, 10 July 2011 (UTC)
 * For anyone who doesn't speak computer, the code above roughly translates to:
 * If the Eye of Cthulu is not being spawned this night (that's my assumption for what WorldGen.spawnEye means, correct me if I'm wrong), and the moon's phase is not 4 (which is most likely the new moon), and a random number between 0 and 6 (inclusive) equals 0, and netMode is not 1 (not sure about this), then start a blood moon. Henix Aurorus (Henix879) (talk) 19:02, 9 October 2013 (UTC)

Water Candle edit
Water Candle edit: Any proof of this behavior? DocHoncho 03:17, 6 July 2011 (UTC)
 * I can post the code for you, if you like. --GauHelldragon2 (talk) 17:47, 19 October 2013 (UTC)

What is a "city?"
Can a more specific qualifier be put for the point "Monsters will also spawn inside cities, despite the natural spawn protection they give", because what exactly is a "city"? As far as I can tell I haven't seen monsters spawn inside the rooms @ houses which an NPC has claimed. - Spinfx 06:36, 20 July 2011 (UTC)


 * A city is a mini biome when 3 or more housed NPCs are close together. If you go to the biome page it may say its called a town. 12.20.99.245 14:57, 15 April 2022 (UTC)

Maximum Spawns
I think the amount of Maximum spawns during a blood moon is decreased by 30% or so. Could somebody check this up in the code?
 * It's increased by 79.999995231628%, actually. --Lunboks 12:36, 23 July 2011 (UTC)
 * Where did you get that crazy number from?--DoubleFloat 21:11, 25 July 2011 (UTC)
 * From the "decompiled" code. In the real source code, it's probably a static expression that is optimized into this exact number. --Lunboks 21:22, 25 July 2011 (UTC)
 * Hm the code I'm looking at just says NPC.maxSpawns = (int)((float)NPC.maxSpawns * 1.8f); for the bloodMoon block. I'm sure it's some sort of floating point shenanigans. --GauHelldragon 00:12, 26 July 2011 (UTC)

Bad Blood Moon luck?
It's the third night in a row I've had a blood moon (Right now it's a Waxing Gibbous) on one of my saves (EoW defeated, EoC defeated, Skeletron defeated.) Recently I did spawn another EoW with worm food. Is that what's causing it? Or bad luck? or a glitch/bug?
 * On the contrary, I have had at least 15 weeks of in game time with no blood moon. I have hardmode enabled and every boss killed. I start a new world and get blood moon the second night.

Blood moon 1.2
Water now appears red during blood moon. Ayamaori (talk) 10:40, 2 October 2013 (UTC)

It's also WAY more frequent. The empirical odds of Blood Moon on my first and only 1.2 world thus far are something like 1 in 2 (this is obviously not a maximally accurate measurement, but I have just experienced three in a row). 81.68.152.27 22:42, 2 October 2013 (UTC)

I think that the Harpy/Wyvern spawn altitude is also lower during a bloodmoon and eclipse. The top of my base spawns harpies only during those events. 68.196.61.47 17:38, 19 October 2013 (UTC)
 * It's likely that NPCs in your base are preventing the harpies from normally spawning. During a bloodmoon, NPCs no longer stop enemies from spawning. --GauHelldragon2 (talk) 17:48, 19 October 2013 (UTC)
 * I also have the major problem of harpies and wyverns spawning at a much lower altitude. This also happens during a halloween moon event and its a serious bug.  It has nothing to do with NPCs. It happens on small worlds.

And effects of blood moon aren't gone when it rains. I collected plenty of raincoats from the zombie horde. 93.84.64.42 13:34, 26 December 2013 (UTC)

About the Face Monsters
Apparently someone put a note that said that Face Monsters can spawn during a Blood Moon.

I have removed this note from the page, as I have never seen it myself.

I will be testing the theory thoroughly, and will report my finding later. Until then, please do not re-add the note. Henix Aurorus (Henix879) (talk) 18:57, 9 October 2013 (UTC)

The player may have been near Crimson, or mistaken a blood zombie for a face monster. Anonymous132547698 (talk) 18:33, 16 December 2016 (UTC)

Health requirement
Is the condition to get a Blood Moon having MORE than 120 life or AT LEAST 120 life? This page says more than 120, but some other sources say otherwise.
 * After asking (better late than never) a user who can read the code (here) it seems the condition is to have more than 120 life. In addition to that I earlier decided to simply place a 120-life character in a world to see if any Blood Moons would occur (speeding up the time/night-cycle through TShock), and none occurred with 20 nights. NoseOfCthulhu (talk) 22:59, 28 April 2014 (UTC)

Game suggestion
i think blood moon should be summonable for farming purposes who agree with me?
 * Interesting idea, but I doubt many players will see it here. I suggest you head over to the official suggestion forums instead. Just keep in mind that your idea may already have been suggested by other players. NoseOfCthulhu (talk) 20:17, 27 April 2014 (UTC)
 * Yeah! You can summon a solar eclipse with a solar tablet, so why not implement a blood tablet or something to summon a blood moon? Anonymous132547698 (talk) 18:32, 16 December 2016 (UTC)

As of April 3rd, 2016, game suggestions are not allowed on talk pages (Terraria Wiki:Rules). This conversation took place prior to that date and is thus left for historical record. --Rye Greenwood (talk) 17:12, 2 March 2019 (UTC)

Possible Reference to Period
Should this reference stay or not? Someone removed it. IMO this reference is quite obvious but might be not for some. FunAlways (talk) 03:09, 7 March 2015 (UTC)
 * I thought about it a little and I'm re-editing the page to note the correlation, albeit edited to be a bit more analytical. Most of the rationale for its removal is the same as the Golden Shower and Mourning Wood- it's gross or tasteless or inappropriate for kids. Don't consider this a defense or endorsement though- I just don't see good enough grounds for its removal, and no one has stated any beyond "ew". Gearzein (talk) 03:48, 7 March 2015 (UTC)

Really really really bad luck? Or coding typo? Or what!
Ok on Wii U I have had SO SO SO many blood moons in this world. I have defeated every pre Hardmode boss (crimson world) except the eater of worlds, king slime, and the wall of flesh. I have spent about 40-85 hours in this world and it seems atleast 1/4 of my nights are blood moons. I have had 3+ occasions where I had 2-4 blood moons in a row. Sometimes it stops for around a (terraria) week or just for like one night. I would say I have had atleast 15-20 blood moons so far. I’m not sure if this changes anything but: this is my farthest progressed world and character, I have built a hotel enough for twenty NPCs about half way to space or two thirds I have explored most of the underground in the middle fourth have defeated 4 eyes of Cthulhu, explored most of the dungeon have not unlocked all of the chests Theextroardinary (talk) 18:21, 1 March 2019 (UTC)

Also I have explored a sky island have myself dyed and have protected the crimson with iridescent brick. I have not thrown too many items away have three pet summons and made a fake cave with a ale stone wall and have it wired to actuators and torches. My goodness I should stop this is probably useless. Theextroardinary (talk) 18:23, 1 March 2019 (UTC)

Full Moon Squeaky Toy
It should be listed here as being sold by the Zoologist during a Blood Moon.
 * Added. For the future, you can add content to the wiki yourself. Don't worry if you mess up, other editors will fix it. — P h i l o 0 4 17:30, 12 July 2020 (UTC)

Money trough
The money trough can drop from the zombie merman and wandering eye fish too. Can someone update it to show that?12.20.99.245 15:16, 15 April 2022 (UTC)
 * Added. Also fixed an issue with the switch icon not displaying for Wandering Eye Fish and Zombie Merman. — Ferretwings, Wiki Specialist 17:55, 15 April 2022 (UTC)