How does the Day/Night cycle work on the Elemental Plane of Fire?

So I found out, that there is a curfew every night in the City of Brass on the Elemental Plane of Fire. This makes me wonder: How does a day/night cycle work on the Elemental Plane of Fire? Is there a sun and if so, does it rise and set like a normal sun?

I’m looking for informations in any sourcebook of whatever edition of Dungeons & Dragons.

Does Astral Projection spell fail if cast while on the Elemental Planes or Material Echo Planes (Shadowfell, Feywild)?

Further to the question: Can there be portals in the Astral Plane that lead to the Elemental Planes , I wanted to ask does Astral Projection spell fail if cast while on the Elemental Planes or Material Echo Planes (Shadowfell, Feywild)?

According to the Etherealness spell (PHB p238) :

This spell has no effect if you cast it while you are on the Ethereal Plane or a plane that doesn’t border it, such as one of the Outer Planes.

According to the Astral Projection spell (PHB 215):

You and up to eight willing creatures within range project your astral bodies into the Astral Plane (the spell fails and casting is wasted if you are already on that plane).

And later in the same spell description:

Your astral form can freely travel through the Astral Plane and can pass through portals there to any other plane.

However, according to DMG in the description of relevant planar travel spells (DMG pg 46) it indicates the following :

And the astral projection spell lets adventurers project themselves into the Astral Plane and from there travel to the Outer Planes.

Accordingly, for both RAW and RAI, does Astral Projection spell fail if cast while on the Elemental Planes or Material Echo Planes (Shadowfell, Feywild)?

Can there be portals in the Astral Plane that lead to the Elemental Planes?

In the spell description of Astral Projection (PHB pg 215) it indicates the following :

Your astral form can freely travel through the Astral Plane and can pass through portals there to any other plane.

However, in the Astral Color Pools table (DMG pg 47) there are no color pools leading to the the Elemental Planes (or the Shadowfell or Feywild). The description of "color pools" refers to them as "gateways".

Finally, in the description of relevant planar travel spells (DMG pg 46) it indicates the following :

And the astral projection spell lets adventurers project themselves into the Astral Plane and from there travel to the Outer Planes.

Accordingly, can there be portals in the Astral Plane that lead to the Elemental Planes?

Does Elemental Affinity apply to Create Bonfire?

Elemental Affinity

Starting at 6th level, when you cast a spell that deals damage of the type associated with your draconic ancestry, add your Charisma modifier to that damage. At the same time, you can spend 1 sorcery point to gain resistance to that damage type for 1 hour.

Create Bonfire:

You create a bonfire on ground that you can see within range. Until the spell ends, the magic bonfire fills a 5-foot cube. Any creature in the bonfire’s space when you cast the spell must succeed on a Dexterity saving throw or take 1d8 fire damage. A creature must also make the saving throw when it moves into the bonfire’s space for the first time on a turn or ends its turn there.

The spell does not deal damage directly, it creates a bonfire, and the bonfire can potentially deal damage. But then perhaps that’s the same as creating a fireball, the spell doesn’t deal damage, the giant burning ball of flame it creates deals damage.

However, create Bonfire is Conjuration, whereas Fireball is Evocation, so perhaps it’s different.

I suppose the difference is that it could be a few turns later that someone steps in the fire and gets burned.

Does it count?

Does Elemental Adept ignore Absorb Elements

Scenario: A sorcerer with Elemental Adept (Fire) casts Fireball at a wizard, who uses their reaction to cast absorb elements. The wizard claims that his spell protects him and he takes half damage (or 1/4 with a successful save) while the sorcerer claims that his fire spells ignore resistance and therefore the wizard only gained an extra 1d6 fire damage on his next melee attack by casting absorb elements.

Elemental adept says

Spells you cast ignore resistance to damage of the chosen type.

While absorb elements says

The spell captures some of the incoming energy, lessening its effect on you and storing it for your next melee attack. You have resistance to the triggering damage type until the start of your next turn.

My initial read says that absorb elements gives the wizard resistance but Elemental Adept ignores resistance and therefore absorb elements would not protect the wizard from the damage of the spell at all. On the other hand, we know there isn’t any fluff text in 5e, and the Absorb Elements spell specifically says "lessening its effect on you". It can’t lessen the effect on the wizard if the wizard still takes the full damage.

So which rule is the more specific rule in this case? I think it would be Elemental Adept specifically ignoring resistance to fire and not Absorb Elements lessening the effect on the caster, but I want to know which ruling is more supported by RAW.

Does the Elemental Gem require Concentration?

Does an elemental summoned from an Elemental Gem require Concentration? I am getting hung up on the "as if you had cast" part. Other items say, "you can use an action to cast the [spell]".

Elemental Gem

This gem contains a mote of elemental energy. When you use an action to break the gem, an elemental is summoned as if you had cast the conjure elemental spell, and the gem’s magic is lost. The type of gem determines the elemental summoned by the spell.


Related question: Do magic item spells require concentration?

The distinction I’m asking then is if the Elemental Gem is a spell or a spell-like effect.

Are there any 5th edition elemental plane rules or details?

I have been reading through Volos Guide to Monsters and Mordenkainen’s Tome of Foes and gained a lot of interesting knowledge of various facets of the D&D universe, namely the 9 hells, abyss, feywild, etc. Even the Astral Plane is covered in both the Mind Flayer and Gith sections of those books.

However one area that I have not yet found any detailed information on are the elemental planes.

Has this information been published in a D&D 5th edition book yet, or is it something we are waiting on? I am specifically looking for details on the various details of each of the elemental planes, ideas for running adventures in each, the population centres and what they consist of (for instance I know historically there is a city in the Fire Plane), the native inhabitants and how they exist and live in each plane.

I know there are brief descriptions given in the PHB and DMG. I am looking for anything of more detail that may have been published in 5th edition. Or, failing that, suggestions of previous editions sourcebooks I can mine for information.

Does Elemental Wild Shape work like regular Wild Shape?

A Druid of the Circle of the Moon gets a feature called Elemental Wild Shape which allows them to transform into elementals. I couldn’t find anywhere that said one way or the other, do the usual restrictions of Wild Shape apply to Elemental Wild Shape? For example, can a Druid cast spells while shapeshifted into an elemental?

If not, the Beast Spells feature allows a Druid to cast spells while shapeshifted, but specifically mentions beast forms. Can a Druid with the Beast Spells feature cast spells while in elemental form?

Ice Troll (RotFM) Cold Aura vs. Wild Shape Fire Elemental

In Rime of the Frost Maiden, the Ice Troll has the following ability:

While it’s alive, the troll generates an aura of bitter cold that fills the area within 10 feet of it. At the start of the troll’s turn, all nonmagical flames in the aura are extinguished. Any creature that starts its turn within 10 feet of the troll takes 10 (3d6) cold damage.

Meanwhile I have a Druid who can Wildshape into a Fire Elemental. Would that be considered magical fire? Also, if the Troll is ignited due to the Fire Elemental, would that extinguish the flames?