Is there any mundane way to travel from the Border Ethereal of a plane to the plane itself?

Say a commoner with no spells, class features, or magic items is Plane Shifted from the Material Plane to the Border Ethereal.

The DMG makes mention of "curtains" that allow travel from the Deep Etheral to the Border Ethereal, but nothing of any portals in the Ethereal plane itself.

Is there any way for this individual to return to the Material Plane?

Can a Legendary with the Nature/Oceans/Sky Aura summon itself?

In the Blessed and the Damned, Legendary Pokémon are given auras that grant special abilities to make them even more formidable. Three of these allow the user to summon a combatant of a level equal to their own (Or half their level if the combatant is a trainer).

I can not find any limitations to these combatants other than the level. Could this aura be used to summon an exact duplicate of the Legendary in question? I understand that in many cases this makes no sense, but it could be a way to explain Celebi’s gimmick where dozens of it from different times appear: One summons one other. Next turn, both summon one more each- Etcetera.

Is it possible to make a common PC bluetooth card identify itself as headset? [closed]

My objective would be to make an application that makes the computer identify as a headset, so I can connect my phone to it and route the audio of the calls to the computer.

I think this is highly related to security. I’m talking about the ability to make a device identify as something else, think about the USB rubber ducky, now replace "USB" with "Bluetooth".

That’s why I posted here. The purpose of doing this would not be anything malicious, I just want to connect my phone to the PC so I can hear the voice of the person calling me on my phone, through the headset connected to my PC:

Phone -> Bluetooth -> Computer -> Headset

Why do all metals corrode when attacking a Rust Monster, yet it itself can only target ferrous metals

When you attack a rust monster, the following may apply:

Rust Metal. Any nonmagical weapon made of metal that hits the rust monster corrodes. […]

So, bronze for example being a metal would corrode.

But the rust monster has the following action:

Antennae. The rust monster corrodes a nonmagical ferrous metal object it can see within 5 feet of it. […]

But seeing as bronze is not ferrous, it cannot be targeted.

What is the lore reason behind this?

Can a creature kill itself by dashing during a chase?

DMG p.252

During the chase, a participant can freely use the Dash action a number of times equal to 3 + its Constitution modifier. Each additional Dash action it takes during the chase requires the creature to succeed on a DC 10 Constitution check at the end of its turn or gain one level of exhaustion.

Suppose a creature was in a chase and already at Level 4 of exhaustion. It chose to continue dashing and at the end of its turn failed its constitution check.

DMG p. 252

A participant drops out of the chase if its exhaustion reaches level 5, since its speed becomes 0.

Now suppose a creature that was [allowed to Dash twice on its turn] started its turn at exhaustion level 4 and chose to Dash twice. At the end of its turn, it would be required to make two Con checks. If it failed the first check and got to Exhaustion Level 5 would this immediately remove it from the chase and thus remove the need to check again, or would a second check still be required with the possibility of death if it failed?

Note that exhaustion from chases has a different recovery mechanic than other exhaustion, in that (DMG p. 252)

A creature can remove the levels of exhaustion it gained during the chase by finishing a short or long rest.

whereas exhaustion gained by other means requires a long rest, food, and drink. Thus there is some evidence that while chases are temporarily exhausting, the exhaustion gained from them is not as serious or as lasting. Might this include the chase-induced ‘death’ as well?

What is the theoretical result of flattening a list containing only itself?

Consider the following python code

X = [None] X[0] = X 

This has many fun properties such as

X[0] == X 

and

X[0][0][0][0][0][0][0][0] == X 

I understand how this works from a practical standpoint, as it’s all just the same pointer.

Now, when flattening a list, we tend to convert things from

[[1, 2, 3], [[4, 5], [6, 7]], 8, 9] 

to

[1, 2, 3, 4, 5, 6, 7, 8, 9] 

In this case, I am considering flattening to be reducing a multi-dimensional list down to a single list of only non-list elements.

In practice, flattening this list would be impossible, as it would create an infinite loop.

This may be more mathematical in nature, but I’m unsure how to put it in mathematical terms. Suppose we could flatten this list, would the result simply be the empty list?

For context, I initially got this idea by considering the list

X = [[], []] X[0] = X 

It is clear to see that at each pass of flattening, the empty list that is the second element simply disappears. This lead me to think that the overall result, may be the empty list.

Could it be possible that flattening this list would theoretically produce an infinitely long list of the list itself, as in

X == [X, X, X, X, X, X, ..., X] 

This is purely a fun thought exercise. Any insight and discussion on this would be appreciated.

P.S. Although I’m looking for an answer in plain terms, if anyone is more mathematically inclined, I would be interested to see how this problem could be formulated in some sort of set notation. Please feel free to point me to a relevant math exchange thread as well.

P.P.S. I would also be interested in a solid proof (not formal) to go along with the answer.

Storing the password to a vault in the vault itself?

Is there an additional risk associated with storing the master password to a vault inside the vault itself?

I would assume not, since in order to decrypt the vault you must already have that password. But maybe I’m missing something?

And without reuse concerns, anything that can steal the password from the unlocked vault can also just steal the vault itself, so no additional information is being exposed that way.

As to why, besides academic curiosity, I’ve also noticed that sometimes the web version of the vault does not automatically log me in, even if the native app is unlocked. So adding the vault password would simplify that process.

How does flexible casting interact with itself?

As I find builds about the Coffeelock (for peoples who doesn’t know, it’s a build that hollow you to have an infinite amount of 5th level spells slot RAW, involving a sorcerer multiclassing in warlock), I turned out asking myself a question:

How does flexible casting interact with itself?

To be clear, I want to know if you can turn created spell slots into sorcery points RAW (which could mean you have an infinite source of sorcery points if you need to do metamagic with your infinites spells).

How would Google treat a GitHub-Pages site, that is based on the same content as the GitHub repository itself?

I’ve just created a GitHub Pages "site", out of one of my repositories on Github. Basically it’s just a landing page, that pretty-prints my readme.md file(that is found in the repo). GitHub allows you to create such a site automatically.

I don’t know too much about SEO, but i’ve heard that google takes into account "duplicate" content, as a "devaluation" factor.

So i was wondering: If google finds a Github repo page, that outputs some readme.md file, and then finds a Github.io(GitHub Pages) page, that has almost the identical content- would it treat it as some duplicate, and apply some kind of penalty to it?