Digging around, I can't find a definitive Monster Manual based answer here. But, there is a little piece from one of the published adventures for D&D 5E.
From Out of the Abyss (Spoilers, obviously)
we get this little snippet:
The only other possible answer I can give you is rooted in Science, which has a shaky relationship with a Fantasy world anyway.
An owlbear's screech echoes through dark valleys and
benighted forests, piercing the quiet night to announce
the death of its prey.
The 4e owlbear has an encounter power called 'Stunning Screech', and it's upgraded cold-themed variant has a 'Frost Wail'.
No information appears to be present regarding sounds from owlbears in ...
A warlock is defined by a pact with an otherworldly being.
Why would they think that killing the patron ends the pact? Sadly for your warlock, the obligation comes from the pact, not the patron. No doubt the dead patron has heirs and assignees who will explain this.
That’s assuming that the pact hasn’t already been restructured into several CPOs (...
Hope the dragon doesn't come
I'm being a little facetious obviously, but in the fiction of Forgotten Realms for most towns (as opposed to a large city) without nearby adventurers the plan for a dragon defense is to hope they never need to worry about it and evacuate if they see it coming.
And lest you think this is unrealistic and that a town would try to ...
Disclaimer: This answer was written before the addition of the 5e tag. The content below may not be applicable to that specific edition of D&D.
D&D 3.5's Draconomicon actually has several examples of dragons having specific smells. It seems to vary by dragonflight color:
Black - Smells like rotten vegetation and foul water.
Blue - Smells like ozone ...
There's not a lot to go on in official 5E materials, but there's a few clues in the monster description which we can extrapolate from. Note that since the default setting in 5E is Forgotten Realms, what follows is Forgotten Realms lore. Unicorns in other settings might be very different.
To start, these are regional effects that might apply to a unicorn's ...
It’s impossible to prove a negative, but I’m rather sure there is nothing official that covers this. To that end, here are all the most likely sources across all of D&D to cover something like this, and how they don’t.
Note that numerous sources discuss how fiends all have names other than their “true name,” that they could use for this purpose. As ...
Spell slots represent the caster's mental limits
D&D 5th edition's Player's Handbook, p. 201, under Spell Slots, describes them thusly:
Regardless of how many spells a caster knows or prepares, he or she can cast only a limited number of spells before resting. Manipulating the fabric of magic and channeling its energy into even a simple spell is ...
They cannot enter
You've put in the relevant quotes in your answer, they simply can't enter and that's all the info that 5e has given us. With no details provided by source books, the DM is free to narrate with what works for the story they are telling.
A DM can add whatever narrative they'd like around that, but mechanically it's simple: they can't go in.
It’s how real-world alchemists did things
Which is likely something that Gygax—and Vance, assuming Vance’s novels also including writing spells down—would have known.
There are famous alchemists. Plato is arguably the father of “Western” alchemy, and he’s one of the most-published authors of all time. Jābir ibn Ḥayyān is the first person in recorded history ...
Owlbears do indeed lay eggs. One of my personal favourite features of AD&D 2nd Edition is that most every monster entry includes details on their appearance, behaviour, social organization (if any), habitat, and ecology. The ecology notes for the Owlbear in the Monstrous Manual read in part:
[Owlbears] are warm-blooded mammals, but lay eggs. […] ...
You should be more assertive
Can my character have this hairstyle
It is your character, so ultimately it's up to you. If you say she has a ponytail, she does.
female characters usually do not tie their hair
But your character does. She is a combat cleric, she can't allow an unfortunate mistake (like hair getting into her face) to mess things up in a ...
What the Player's Handbook says
In Chapter 4, "Personality and Background", the Subsection "Character Details" has a header titled "Sex" that makes the following remarks (emphasis mine):
You can play a male or female character without gaining any special benefits or hindrances. Think about how your character does or does not conform to the ...
In "official D&D 4e rules"? No. But if by "friend" you mean "my DM", then the answer might be yes. On the other hand, if by "friend" you mean a fellow player, they are most likely yanking your chain.
DMs are the ones responsible for deciding details of culture in their games, so it's up to them and we can't tell you for sure. Either way, ask your DM, ...
It certainly exists in the Realms, but the sources don't give a reliable sense of how commonplace it is.
In a quote in this article, Forgotten Realms creator Ed Greenwood says that there are gay characters in Faerûn:
Folks, the Realms have ALWAYS had characters (mortals and deities) who crossdressed, changed gender (and not just to sneak past ...
As you noted, according to the PHB:
Regardless of how many spells a caster knows or prepares, he or she can cast only a limited number of spells before resting. Manipulating the fabric of magic and channeling its energy into even a simple spell is physically and mentally taxing....
So therefore, spell slots are an abstraction of arcane potential: how ...
I wondered this before myself, I found that Wikipedia had most of my answers.
The Forgotten Realms is a fantasy world setting, described as a world
of strange lands, dangerous creatures, and mighty deities, where magic
and supernatural phenomena are quite real. The premise is that, long
ago, the Earth and the world of the Forgotten Realms were more ...
A unique and highly unusual new dragon offspring, who is typically sterile
The D&D 3.5 sourcebook Draconomicon (2003), p.27 asserts that dragons of different types can produce hybrid offspring:
Crossbreeds between dragon species are not unknown, but very rare. A hybrid dragon of this sort is usually left to fend for itself, but on occasion both ...
Gary Gygax (2007): Elves' positive energy makes them immune to paralysis from ghouls
Gary Gygax answered exactly this question on a forum in 2007, (typo original):
When I devised the ghoul for the D&D game it was most assuredly with non-living energization, that is undead status, that enabled these creatures to exist and hunger for the flesh of dead ...
1974, 1990, or 2004, depending
In each of these years, a new option was introduced to D&D that was labeled “warlock.” It wasn’t until 2004 that the warlock was its own class, but 1990 had warlock as a wizard kit (similar to 5e’s subclasses), and 1974—that is, the original books for D&D—had warlock as a title held by magic-users of a particular level.
Nothing happens, at least in 5e. The Pact only initiates your power; you don't need the Patron after that.
The answer to the question you linked was wrong. Becoming a Warlock is a one-time infusion of power that gives you the ability to take the first Warlock level; any further powers you develop after that are the result of your own developing abilities. ...
A troll's severed body parts remain 'connected' to the troll. Severed parts die when the troll regenerates them.
I am drawing my information from the 'Variant: Loathsome Limbs' sidebar under the Troll's entry in the 5th edition Monster Manual (page 291). This variant trait describes in mechanical detail what happens when you sever the arms, legs or head of ...
The DMG provides insight: they are divine creations.
The DMG states on page 11 (emphasis not mine):
Quasi-deities have a divine origin, but they don't hear or
answer prayers, grant spells to clerics, or control aspects of
mortal life. They are still immensely powerful beings, and in
theory they could ascend to godhood if they amassed enough
D&D 5e is a set of rules and bits and pieces of lore ideas, but it has no setting. There are no maps of the “D&D 5e world”, no noble houses — nothing except the bits of background on the races. There is no canon setting. There are canonical details for some settings that you can use with D&D 5e, but they are separate and not the default setting ...
They Would Be Called "Magic"
A +1/+2/+3 weapon, shield, armor, ammunition, etc. have historically been referred to as a "magic" version of that item: magic weapon, magic shield, magic arrow, etc. (though, Volo preferred the term "magical").
In 5e specifically
The Magic Weapon spell (PHB p.257) itself is an example of this nomenclature still being used, ...
It's time to talk to your DM. You clearly have ideas about the general shape of your backstory, but you need to know some things that "everyone in the setting knows" and you need names, places and dates that don't conflict with the setting's plots, or the DM's own ideas for their campaign.
It may well be that the DM will use your backstory to help develop ...
This question ultimately boils down to this: Can the Tarrasque (even if it has Regeneration) drown?
*: Assuming absolutely everything goes precisely as you expect it to.
From the Basic Rules...here's how Suffocation (i.e. Drowning, in this case) works.
A creature can hold its breath for a number of minutes equal to 1 + its Constitution modifier (...
The Forgotten Realms wiki page on gelatinous cubes has the information you are looking for in the "Ecology" section:
Gelatinous cubes reproduced asexually by either dividing themselves into two smaller cubes of equal sizes6 or via budding. In the second case, a smaller, rubbery cube was excreted into a side corridor or on a pile of refuse, and ...
Someone who has strong draconic ancestry, e.g. half their ancestry (one parent, or child of two half-dragons, whatever; someone who was, strictly-speaking, a quarter dragon or eighth dragon might still be modeled with the half-dragon rules). Literally is a dragon, in game terms and in fluff terms, though with a roughly humanoid body shape.