What kinds of Metallic Dragons were ever shown in D&D products? [closed]

Everyone knows the iconic metallic dragons that come in almost every single core monster book, Gold, Silver, Bronze, Copper, Brass. Let’s call those the “core five”

There were some others, like dunno Steel, Iron, Platinum, Electrum, Uranium(?), and what else…

What kinds of metallic dragons other than the “core five” were shown in D&D products?
What were their ecologies and demeanors?
In what worlds did they debut/existed?

Can the Heat Metal spell target a set of Dragon Scale Mail made from metallic dragon scales?

The heat metal spell can target "a manufactured metal object", including "a suit of heavy or medium metal armor".

A suit of Dragon Scale Mail is clearly a manufactured object, but if it’s made from metallic dragon scales, is it metal, and thus a valid target? Are bronze dragon scales actually made of bronze, or are they just colored like that?

I’m just assuming chromatic dragon scales are inarguably organic.

Are there any examples in D&D lore (all editions) of metallic or chromatic dragons switching alignment?

In a previous question I asked about a dragon antagonist I am planning. I originally intended this to be a chromatic dragon because I believed they are always evil, but an answer to that question got me thinking.

In the Monster Manual it states that all chromatic dragons are driven by greed and selfishness and are feared by all people.

Likewise, all metallic dragons are good.

However, are there any examples in the lore of either of these being switched? I imagine it would be more likely that a metallic dragon becomes evil than a chromatic dragon becomes good, but are there any outliers at all?

I am willing to accept any examples from any of the editions of D&D or the broader fiction written around the setting.

Handling metallic roughness maps colour channels

I’m trying to use a metalness/roughness workflow and I’m not sure how to translate the colour channels into the different metalness and roughness attributes. I’m not sure if there’s a standard on how to encode that information and I can’t find any online resources on how to treat the colour channels so I’m guessing that there is no standard.

I have had materials which have used only the R and B channels and having the B channel set as 0 and I have had materials that somehow use all the RGB channels and I’m confused as to why they would need a third channel to determine metallness and roughness.

My question is, how should I determine the format that the map is in and which channel corresponds to which attribute?

Update: I’ve already come to terms that I’ll probably have to compile new shaders for different materials but I’m trying to figure out a way of identifying the format that a map is in. It would appear that for one of the models I’m using, it stores its bump map in the R channel. I didn’t even know that was an option

Update 2: I imagine I’ll have to just delegate this to the asset pipeline and have the user select which channels to sample from. That or have a hardcoded format and make sure that any PBR materials imported follow that format

What is the CR of a Metallic Dragon that used Change Shape?

The older Metallic Dragons have the Change Shape ability :

Change Shape. The dragon magically polymorphs into a humanoid or beast that has a challenge rating no higher than its own, or back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (the dragon’s choice). In a new form, the dragon retains its alignment, hit points, Hit Dice, ability to speak, proficiencies, Legendary Resistance, lair actions, and Intelligence, Wisdom, and Charisma scores, as well as this action. Its statistics and capabilities are otherwise replaced by those of the new form, except any class features or legendary actions of that form.

The dragon retains many things, but not explicitly its Challenge Rating (CR). What happens to a metallic dragon’s CR when it uses Change Shape ?

  1. The CR remains the same (ex: 20 for Ancient Brass Dragon)

  2. The CR is that of the assumed humanoid or beast (ex: 0 for Commoner)

I am honestly not quite sure, it could go either way.

If an Ancient Metallic Dragon uses Change Shape to turn into a humanoid with Innate Spellcasting, do the uses of “X/day” spells reset each time?

Ancient Metallic Dragons (e.g. Ancient Brass Dragons) have the Change Shape ability:

Change Shape. The dragon magically polymorphs into a humanoid or beast that has a challenge rating no higher than its own, or back into its true form. It reverts to its true form if it dies. Any equipment it is wearing or carrying is absorbed or borne by the new form (the dragon’s choice).

In a new form, the dragon retains its alignment, hit points, Hit Dice, ability to speak, proficiencies, Legendary Resistance, lair actions, and Intelligence, Wisdom, and Charisma scores, as well as this action. Its statistics and capabilities are otherwise replaced by those of the new form, except any class features or legendary actions of that form.

It is my understanding that the Spellcasting feature is a class feature and thus unavailable to an Ancient Metallic Dragon, but that the Innate Spellcasting trait is available to them.

Now, let’s take in example the Gloom Weaver humanoid from Mordenkainen’s Tome of Foes (p. 224), who has the following not-at-will Innate Spells:

1/day each: arcane gate, bane, compulsion, confusion, true seeing

If, say, an Ancient Brass Dragon decides to use Change Shape to turn into a Gloom Weaver, then decides to cast its 1/day true seeing, then uses Change Shape to revert to their dragon form, and uses it yet again to become a Gloom Weaver once more… does the dragon thus have a new use of true seeing?

In other words, does an ancient metallic dragon have essentially unlimited “X/day” innate spells by way of using Change Shape back and forth?

Does a spellcaster with Lair actions keep them when Shapechanging into an Ancient Metallic Dragon who then uses Change Shape?

A few high level arcane spellcasting monsters, such as the Lich from the Monster Manual, also have Lair Actions.

Such spellcasters can prepare then cast Shapechange on themselves to become an Ancient Metallic Dragon (such as a Brass one), while keeping some things :

You retain the benefit of any features from your class, race or other source and can use them, provided that your new form is physically capable of doing so.

It is my understanding that the above would allow the Lich to keep its Lair actions in dragon form.

Such dragons have a special Change Shape ability to transform into a humanoid or beast (such as a rabbit) while keeping certain things :

[…] retains its alignment, hit points, Hit Dice, ability to speak, proficiencies, Legendary resistances, lair actions, and Intelligence, Wisdom and Charisma scores, as well as this action.

It is clear from the Monster Manual’s Errata that the Lich could not gain the Dragon’s Lair actions (or the resulting beast/humanoid lair actions, if any) :

If a creature assumes the form of a legendary creature, such as through a spell, it doesn’t gain that form’s legendary actions, lair actions, or regional effects.

But what I’m wondering here is whether the now-twice-transformed creature would retain its initial form’s Lair actions. In this example, would the Lich-transformed-into-an-Ancient-Brass-Dragon-transformed-into-a-Rabbit keep its Lich Lair actions ?

sturdy, metallic chess clock as carry-on baggage

I am an amateur chess player and I am considering flying from the US to Europe with the following chess clock:

https://www.amazon.com/Chronos-GX-Touch-Chess-Clock/dp/B0015V3ZZ0

I am a concerned that the clock is a bit “scary-looking”. It’s also quite sturdy and made of metal (aluminum) so I guess (my Physics is a bit rusty) that it’s like a Faraday cage with mostly empty space inside it (basically some tiny electronics, some wires and two AA batteries). As such, I am not sure how it shows / registers on the equipment they use and whether it might cause the operators to be concerned.

Is it safe to assume that I will be allowed to take it with me in the cabin as checked luggage? Or should I perhaps take it with me to the airport already opened so they can inspect what’s inside it? (there is a panel that you need to unscrew to change the batteries or see what’s inside — so a screwdriver is required).

What happens when a metallic dragon and a chromatic dragon mate?

Is it possible, and if so, what happens when a metallic and chromatic dragon mate? I’m most interested in blue and bronze dragons.

I’m interested in lore from all editions except the fourth edition. This question is for a specific campaign of mine. General information about dragon lore of breeding habits are also interesting, but in particular:

  1. both what kind of offspring is producing
  2. what kind of lineage would follow for its own offspring?