The actual rarest thing that can happen in Terraria.

[@Terraw]

Hopefully I didn't fat-finger some numbers here. Chances are high given how much there are... even if I did, the range of around 10^500 should be accurate no matter what. Does it even matter at this point? Some people have mentioned possible inconsistencies involving the Mech boss summon calculations which might affect the numbers a bit. (Mechanical summons may only drop 1 at a time, not all 3.) I also may have forgot about Lucky Coin extra-coin chances. Oops! Also, credit to filipssh for the reduced gap design for the hypothetical logic gate thingy.

[@jensthemagicjester347]

Great video! now do it with big content mods installed

[@abserd01]

​@@jensthemagicjester347tbf alot of big content mods make farming less tedious

[@Kiroto50]

You're missing a couple yoyos (Amarok, amazon, etc) which I mentioned to you all many a time

[@Sporketto]

@@Kiroto50also the chance of the enemy dropping a heart that recovers 20 hp

[@shidoitsuka9450]

I think you fat fingered because you forgot biome keys

[@spookyjailopossum]

this is pretty crazy, but i still feel like the daedalus stormbow is just a bit rarer

[@sansgaming607]

😭

[@Billi84-MaBoi]

💀

[@Cringemoment4045]

Basically any item you need

[@stupidcarrot9921]

i was recently farming souls of light and encountered 3 mimics throughout. they all dropped daedalus stormbow. i was a summoner

[@ПавелУшкин-п7р]

When i was farming it, it took me around 30 mimics to get one

[@damnthisisabadname]

Fun fact: The odds of the whole chained faulty gate thing happening is roughly one in 2.466239346 * 10^27966 (this number will have 27996 digits)

[@cykrob]

That's a very bad name

[@damnthisisabadname]

​@@cykrobik

[@VladIsLove22]

Its your 100 comment on this channel

[@sirsamiboi]

I hate to be the one but it would be 27967 digits, because 10^27966 is a 1 followed by 27966 zeros, so 27966+1 digits Crazy fun fact though, that's even more unlikely that me getting a girlfriend! (I hope 😢)

[@damnthisisabadname]

You are correct, my bad@@sirsamiboi

[@xsinam]

My friend casually just getting this chance 3 times in a row while I'm farming for a rod of discord

[@shuenox]

That one friend, who plays for the first time especially

[@MrErizid]

Once you know all the easy ways to stack luck, Rod of Discord farming shouldn't take more than 10 minutes if you have a proper cavern arena set up for spawning mobs.

[@xsinam]

@@MrErizid I'm offended

[@StrikingSimilarity]

@@xsinam Do.. you want to speak to the manager?

[@xsinam]

@@StrikingSimilarity yes, in my legendary playthrough it took my 820 elementals to get the RoD, I want to speak to an RNG god

[@lucky73287]

Sadly all 3 mech summon isnt possible : for every enemy killed, it roll a 1/2500 for destroyer summon. ONLY if it fails then it roll for the twins and skeletron in order try using a max luck mod to see

[@lillypad6936]

I thought that it would be rolling the 1/2500, then another 1/3 to see which drop it is.

[@Manahina1]

the hallow also counters evil biomes, so you can get both a soul of light and night from a single drop.

[@kellamyoshikage286]

@@lillypad6936 Nope, for one thing that would drastically reduce the actual chances of getting the summons, and for another, a separate roll to determine which boss summon is dropped wouldn't be affected by luck; for proof of luck affecting mech boss summons independently, see Wand of Sparking's Dream luck videos.

[@nssheepster]

@@Manahina1 That's only partially true, there is a VERY small zone of overlap between one biome and the next, so technically if you hit it and kill it pixel perfectly the game ends up uncertain as to whether it counts as Hallow or not and can give both drops. It's rare, but if you happen to be farming near where your Hallow and Evil biomes meet you can generally see it happen within an hour or so. The game isn't quite perfect with the Hallow/Evil biome limit, apparently. With other biomes there's, AFAIK, an INTENDED bleed effect area where it counts as both, but the Hallow/Evil thing just gets a bit weird in practice.

[@staringgasmask]

@@Manahina1 that's only true in the surface, I've had pretty large underground areas with corruption/hallow in them. They even have a special background with dark purple crystals, and enemies can drop both souls of light and souls of night. You gotta play with biome reaches and other mechanics though

[@unArthodoxDR]

Oh my, it's that day again where Terrasteel throws an absurd amount of math at our favorite video game! _I'm not complaining though, keep it coming!_

[@DSW79]

I hope that is hair on the pfp dragon's head...

[@monishrules6580]

Keep em coming! You can't escape.

[@nexieadr]

@@monishrules6580NOO-

[@IlovecheeseIwantcheese]

@@monishrules6580This will hurt.

[@eclipticz9195]

He's trying to out rap Eminem with hiw fast he was talking

[@sboogbloog1004]

I'd be interested in the rarest "observable" event too, for example the player can't know anything about their luck or crit chance rolls except by the damage indicator number.

[@AshenDust_]

You can tell how much Crit chance you have, so it’s definitely observable to not get a Crit at 99% Crit chance

[@adon155]

exactly what I was thinking, the vast majority of the increase in rarity comes from the individual luck rolls for every time, which you would have no way of measuring without a mod. Everything else as far as I remember is technically noticeable

[@notmetagaming]

How can you see your crit chance?

[@tpeter4240]

Now we need the most common occurrence in Terraria.

[@TlalocTemporal]

I feel like that would change drastically based on who's playing. Digging particle? Walking animation? Rain drop? I don't know how to state this question in a way that it has a definite answer.

[@adamjeviczki3175]

That would be doing the same setup, and this not happening. Probability works interestingly, but as long as something not happening is an event, then the most likely event is the least likely event not occuring.

[@cakeyeater7392]

Getting slime from a slime? Getting a dirt block from digging a dirt block?

[@YBDaniel]

dying.

[@adambyte256]

That's just any guaranteed event, like jumping when you hit the jump key.

[@Shyguymask]

Dream would be able to get that drop if he speedruns Terraria.

[@Metrocysh]

Multiple times in the same run

[@WomanSlayer69420]

he wouldn't. One in 7 trillion is smaller than a drop in the ocean compared to these odds.

[@glowingplutonium3345]

dream luck goes crazy

[@Oohing8]

@@WomanSlayer69420wooosh

[@gustavrsh]

forsenCD

[@creepjax]

Note you have a higher chance of you and 5 other people choosing the exact same atom in the entire universe than getting this.

[@Nottwitte]

If anyone watching is interested in other ways luck plays a part in Terraria, I recommend Wand of Sparking's Dream luck playthrough. He goes through many different situations that you might not think luck plays a part in, with a lot of number crunching to boot!

[@butchbabytoaster]

Shame he couldn't use that mod in Stardew.

[@uncroppedsoop]

@@chrispy5249 it's not coming from inside the prognosticus itself though

[@hiimapop7755]

I'm always fascinated with stupidly large numbers and rare chances and events, so this video tickled all the right spots for my monke gamer brain. Please don't stop making these useless but fascinating videos, I never get tired watching them. :)

[@demongameryeet]

Completely agree

[@EagleScoutGamer]

And that is less rare than your chances of getting a girlfriend. edit: and that includes myself as well

[@jetstreamsam3977]

Wanna bet

[@sevensagittarius6759]

hello pwrwq from dark gaming

[@yeeterdeleter0117]

True

[@EagleScoutGamer]

@@sevensagittarius6759 hello what is ur ign?

[@Reesemike]

I guess I have dream luck then

[@WomanSlayer69420]

To all you basement dwellers who flunked math class, these odds are lower than the odds of getting 211 5 star characters in genshin impact back to back and winning 50/50 every time.

[@_Suitable]

I have never even heard of terraria before and this is my first introduction? I love it already!

[@enor9379]

bro its like top 10 best selling game of all time how😭

[@slugcatsu]

Buy it NOW.

[@jackofalltrades9938]

You should play it, it’s only like 10 dollars and it’s very worth it

[@TlalocTemporal]

​@@jackofalltrades9938-- I still can't believe that this masterwork is cheaper than a mcdonald's combo. It feels like I paid $40 plus half a dozen DLCs!

[@valeriucb6497]

Lots of replayability too , you can chill , be very casual about it , or challenge yourself , go for higher difficulties , special seeds that completely flip the way you play , hell even replaying under the same conditions multiple times over can be vastly different. Insane modding community that can be done in tandem with all of the above and at the end of the day , double the experience and bring friends over too. 3k hours in the game and still going , best purchase of my life. Game has so much too it and it can feel overwhelming but once you get a bit of progression going the dopamine is so good.

[@WomanSlayer69420]

In order to visualize such a drop rate, it is rarer than an event where if you picked a random atom in the observable universe and imagine each atom as its own universe, then pick an atom from that universe and imagining each atom in that universe to contain its own universe, and so on and so forth, and repeating the cycle three more times before picking an atom from that imaginary universe, then I pick an atom at random and imagine each atom as its universe and so on and so forth with the exact same method as you did, and we manage to pick the same atom in the exact same imaginary universe by random chance.

[@mattguy1773]

this is just pure mathematics and I love it

[@yazeedalfrog]

nah this is statistics, pure math is stuff like real and complex analysis, basically proofs, a lot of proofs.

[@anon1963]

​@@yazeedalfrogno need for gatekeeping, now you may go back to writing your useless proofs.

[@yazeedalfrog]

@@anon1963 unfortunately I'm not writing them just yet, I'm still at the "crying while trying to understand" level

[@anon1963]

@@yazeedalfrog then there is time to save yourself from that psychotic gibberish. thankfully I was spared from that since proofs aren't needed in engineering.

[@Murpler]

As a cookie clicker player, I have seen many large numbers, some I can’t even pronounce properly. But this number tops it without question. I had thought centillion was the largest number with a name, but you leave me gobsmacked. The hell is a septenseptuagintacentillion.

[@TlalocTemporal]

Wait until you hear about the PLEXs, or higher forms of exponentiation.

[@anon1963]

G(64) or TREE(3) are even crazier

[@chronology2.0]

If there is a Bloodmoon, would that not also include the chance to get the KO-cannon (0.1% base drop chance from all hardmode enemies during a bloodmoon)? Meaning you can make this even rarer? Or does that event overwrite some of the other biomes/events you want to happen?

[@mrbleachclean6656]

Ko cannon drops from the clown

[@chronology2.0]

@@mrbleachclean6656 The KO cannon has an increased chance to drop from the clown but can drop from all hardmode enemies during a bloodmoon

[@AveryTheHorror]

you cant have a hybrid evil + hallow biome, which led you to correctly exclude the hallow key from the biome keys list, yet soul of light is still in the drop list.

[@quackelstheduck2040]

bwah bwahh

[@Saplingbat]

I saw another comment saying that only applies to the surface and that it's different underground.

[@purplehaze2358]

This is one of the most convoluted videos I've ever seen.

[@charlieneate5155]

He has become death, destroyer of worlds 💀

[@_fatered_]

We all know that the actual rarest event is rod of discord drop

[@cad97]

This chance is definitely to the so low point that it's probably actually just zero, as there's no initial state of the RNG source which would produce the random results necessary to produce this event. Computers don't use true randomness, they use pseudo RNGs, which can be thought of as a very long list of numbers which seem random.

[@anon1963]

There definitely is

[@NickAndriadze]

Woah, that is some big words and big numbers, *genuinely my favorite.*

[@jaxsomon3333]

Me randomly getting this 3 hours into searching for a 3% drop:

[@patty4449]

Actually having a disk error on the computer caused by an Ion or Atom changing an internal charge is much more rare...

[@brandon_evs]

The rarest thing that occurred to me was obtaining an Uzi when it was first implemented on console version, 1/80,000

[@specs.weedle]

thanks i was wondering where i misplaced my copy of the odds of the travelling merchant selling anything actually useful at the current stage of the game

[@leandrolima4902]

Still more common than the merchant selling what I want. Got this video results two times before it happened!

[@uncroppedsoop]

ok dream

[@rexdoom3848]

4:37 Go ahead, Mom. Take away my Xbox. Nothing you can do can unsex the agintacentillion.

[@maddiestratus]

Honestly, i feel confident in saying that this is one of, if not the rarest thing that could happen in any game, period.

[@wesichi]

not as rare as you getting some bitches

[@superthrower]

I like your funny words magic man.

[@matery77]

What about Amarok? It also has a chance to drop from any enemy in an Ice Biome

[@same_luck_ua1325]

i think that requires ice to be the main biome but i might be wrong

[@musAKulture]

sockrates: what happens with highest luck? terrasteel: what happens with lowest luck? i love you two.

[@imnotnice5186]

i once dropped two biome keys from a single mob and thats all my rare events in game.

[@the13th13]

Sometimes when we don't get the items that we want is considered as bad luck, but who knows the "impossible" chance happened in front of your eyes without you even realize.

[@iplaygames420]

this actually happened to my friend on friday

[@goldengolem4670]

As far as i am aware, they can only drop 1 type of mecha summon at a time, at least thats what i saw in wand of sparking's max luck playthrough.

[@metalurgent]

Any melee player knows that despite all reforges being technically even, warding is the hardest to get

[@r4nd0mguy99]

Honestly, that has nothing to do with melee specifically. I recently tried a summoner-playthrough for once and reforged all of my accessories to menacing. That took a similar amount of money as warding does for melee.

[@adambyte256]

The red and orange rolls at 4:00 shouldn't be multiplied into the overall event chance, because they don't correspond to any result in the game world; they just determine what the numbers in the green rolls will be. What you should've done is assume the strongest possible bad luck, which is the first tick of bad ladybug luck, and compute the average/expected number that each green roll will be as a result of that luck value, and then multiply those green numbers into the overall event chance.

[@kungfudragon321]

And yet a rod of discord dropping somehow feels even rarer

[@wuffles9584]

Remember that one time a guy was speedrunning Super Mario 64 when a solar flare from the ACTUAL SUN WENT INTO HIS N64 and triggered something that made mario go up? factor that into this video

[@Mt.Everest]

And yet, that one friend still gets all that by accident

[@WelderGamesYT]

I have no clue who took the time out of their life to do this but thank you.

[@theshadymoose]

i don't know if this counts, but there's a slightly lower chance (1 in 10^690 i think) of waiting 899 ticks between black recluse's web spit attacks. i saw it ages ago when i was trying to find out poison staff rates (i was a noob) and it has lived in my mind rent free ever since. crazy video!

[@Txv-b5t]

We all have that one friend who would just start learning the game and do this immediately

[@BerriMura]

I like your funny words magic man (Great video, I didn’t understand anything but I enjoyed it either way)

[@BigBoiCelsius]

I don't know what language this guy was speaking but mad respect to you.

[@headcrab4]

Rarest occurence Ive had happen was killing a master mode Dutchman which dropped the coin gun, pirate staff, discount card, and a piece or two of furniture. My mind was blown.

[@frostbite5607]

Well technically you can’t have one enemy drop a crimson and corruption key at the same time, but all the other keys can be dropped by the same enemy. However, the number is so large that it doesn’t matter at this point

[@nikplaysgames4734]

To put this number in perspective, the number of atoms in the observable universe is somewhere around 1*10e82

[@Sporketto]

what about the chance of the enemy dropping a heart to recover 20 hp?

[@C4Oc.]

Does not apply because they don't drop *both* mana stars *and* hearts

[@anon1963]

Then it's just a chance of enemy dropping a heart, since the amount is probably evenly distributed

[@Siinory]

Sooo what Dream gets by just waking up?

[@Gwynhyvr]

you... really did the math. i can't be anything but impressed.

[@dylangibson7524]

This feels like someone's Stats project. I love it

[@Kvailys88]

This is like listening to a DM explain a single rule

[@liljajejiju4023]

This happened to a buddy of mine (trust)

[@Biggiecheese7168]

Having the maximum amount of enemies get killed in the exact same way is an easy increase.

[@kutura_P]

And I thought the rod of discord was rare.

[@rioualion]

Ah yes, another good day of using septenseptuagintacentillion

[@s0fl813]

The actual rarest thing that can happen in Terraria is for cosmic rays falling from the sky to change the entire game's code to Minecraft while it's running

[@Jerrycourtney]

Maybe the _actual rarest event in Terraria_ is all the friends we made along the way.

[@ike47222]

Bro crazy thing, i got all this to happen to me today. I must be a little lucky😆

[@larikkin]

I'd argue that these aren't triggered by one action, you pulling the trigger on the enemy, since you had to make biome combination that afaik doesn't spawn naturally, you have to consume the Midas Flask, kill the ladybug and deplete your mana. That's a lot of assumption for an event trigger.

[@Goat_gamering]

A singular POSSIBLE in gameplay event (that doesn't use wire stuff) is what he is talking about.

[@eagle32349]

I think that the travelling merchant is probably the rarest one by far because you don't even know the chance.

[@renakunisaki]

This is close two the largest number that can be represented in a 64-bit floating point value.

[@kanjiNaem]

3:48 is the terraria source code just public wtf?

[@haseebahmed2544]

By a "trigger" you have the opportunity to spawn a minion and it kills stuff for u so that defenition isnt the best

[@tev5040]

so basically if someone made 6 copies of the observable universe and hid a singular atom in them, youd have a higher chance of guessing which atom it is at random then this happening

[@rodrodrodrodrod]

The pirate was the actual unluckiest thing in this video, he got taken to hell and shot for the sake of science

[@airsquid8532]

You could multiply it by the max mob cap with a multi enemy hitting weapon to see if every single one drops that same load

[@ЖукОбычниик]

I think that due to how randomness in computers works, this could be completely impossible.

[@TlalocTemporal]

Does the chance of using a computer that uses atmospheric noise for it's random functions (thereby making this roll possible) add to the rarity?

[@anon1963]

​@@TlalocTemporalwhat computer that can run terraria uses that kind of rng

[@TlalocTemporal]

@@anon1963 -- Probably a custom rig that's not even internet-capable. Or a rig built by a mathematician to prove this exact point.

[@Lolhappy909]

Uh, sorry if I’m wrong, but I’m pretty sure you can only drop one mech summon at a time, which would remove 2 items from that list, bringing down the number just a little bit. I’m pretty sure it’s completely random which one drops so that’s also a 1/3 chance added onto it. Sorry if I’m wrong but idk 🤷‍♀️ Edit: just remembered that it’s not random, it rolls for destroyer, then if it fails, it rolls for one of the others, and so on.

[@rapidkraken2638]

This happened to my boy Liam

[@mreasysqueeze]

I’m almost 100% sure that you can’t get all mech boss summons at the same time, but all 3 are featured in 4:10 @Terrasteel

[@damnthisisabadname]

You can

[@sodiumfluoridel]

This has me thinking about the time I was playing 1.2 terraria on my dads iPad, killed an ichor sticker, and watched as it dropped two crimson keys

[@alexjurch6041]

That is the rarest thing that can happen in any video game ever.

[@alwinjoseph8413]

Dream: “bet”

[@TopazTom]

Considering a possible Terraria bitflip recently happened, its safe to assume that this video is somewhat outdated

[@Kinglovinstone]

My calculator's sweating trying to keep up with this

[@Traffic_Cone64]

The actual rarest occurrence in Terraria is getting the drop you want from Moonlord.

[@Flowery0]

Was traveling merchant THAT bad?

[@BlackChexi]

That one chinese/asiatic dude: Ive alredy got it

[@crazyjack746]

How would you like your steak: Me:

[@flamingpaxtsc]

Even if you did all of that, it's still SOMEHOW possible to get everything right on the first try. That's kind of insane to think about.

[@Intyy_youtube]

inb4 dream switches to terraria and does this in a 2 and a half our stream

[@that_one_dogg7377]

The gambler in me just looks at that and says "yeah i got this"

[@pain.1901]

This whole video has my face looking like the guy from the ‘forget everything you know’ TikTok duet

[@Spiney09]

This is the real final boss of the luck mod

[@overdramaticpan]

Factorial on the original, so it remains rarer. Though, if we're not grasping at straws any more than usual, this video takes the cake.

[@ampadedoda5027]

Wand of sparking got the work boots on stardew valley, and I'm pretty sure that's got a lower drop rate than this.

[@orthoplex64]

I only ever killed Pirate Corsairs in hybrid Underworld-Snow-Desert-Jungle-Corruption-Crimson-Hallow biomes during Halloween with 1 tick of ladybug luck remaining with a Grey Zapinator that procs all of its effects at once but doesn't crit even with a 99% critical strike chance and having the killing blow receive +14% damage randomization that negative-luck-replaced a +15% damage randomization roll at minimum negative luck, and every time, they dropped the maximum amount of coins possible, the Coin Gun, Warding Lucky Coin, Warding Discount Card, Broken Pirate Staff, Broken Cutlass, Eye Patch, whole Sailor outfit, all twenty pieces of Golden Furniture, Warding Gold Ring, full Buccaneer's set, all five biome keys that can drop, a Soul of Light and a Soul of Night, 50 living fire blocks, 129 golden platforms, a Broken Hel-Fire, all 3 mech boss summons pre-Mechs, two stars, and a Goodie Bag, so I had no idea this is unlikely

[@Maszt14]

Luck of a friend who you showed the game to:

[@Bennet_Froggy]

You could make it even rarer by having the zapinator killing more pirate corsairs after the first

[@GeroldViolenceBlemson]

As soon as I heard "152 octillion" I was already preparing to fast forward past a youtuber reading twenty insignificant digits to pad their video to advertising length, utterly shocked that it didn't happen. Says a lot about society.

[@wickedmagician529]

And yet, given infinite time, this exact event is guaranteed to occur an infinite number of times

[@wesichi]

not quite. say we flip a disc with sides 1 and 2 an infinite amount of times with a 50/50 chance of either side being landed on. what’s the probability that in one population of infinite trials, the disc lands on 1 every single time? a very small non-zero number. we can apply this to the probability function in the video, where 0 is a failure and 1 is a success. there could be a population of infinite trials where we get a 0 every single time, which is infinitely smaller than the chance of landing a 1, but is still a non-zero probability

[@anon1963]

​@@wesichiwe are strictly talking about the event in the video. so yes, given enough time, any event with non zero probability will happen an infinite amount of times. it's a tautology.

[@beaugrylls7771]

Wow what are the chances, this happened to me like 4 times

[@moltensh4dow506]

I killed an undead miner and got a bone pickaxe, hook, and steak all at once, which had a 1/5000 chance of happening.

[@Willdroyd]

Question: would you count this as the rarest event if you need all these steps to happen for this event, even if with different steps you could get the same outcome? with the negative roll and all that shenanigans, would it getting a negative luck roll and then dropping be the same ingame scenario as getting a non negative luck roll and dropping? also why does it have to be the absolute lowest chance and then drop?