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?

What planes have time warping effects?

In the 5e DMG travel to the Feywild is accompanied by a time warping effect, which is determined by rolling on a random table.

My wizard (semi-inspired by an ancient ball of fun from Critical Role) is looking at making a planar home for himself to take advantage of this kind of effect.

I haven’t found anything in 5e, so suspect I will be looking for rules from earlier editions: what planes have stable (ie: not rolled on a random table) time warping effects?

Specifically I am looking for a plane on which I can spend a long time, then step back into the material plane where a shorter time will have passed, even more specifically I am looking for one without negative side effects! Yes this is a classic ‘how can my wizard extend their life’ question.

So far everything I have found either has a side effect, is randomly rolled, or is the far realm (according to the 3.5 manual of the planes, and even that isn’t clear about no negative effects upon returning, but might have to do for my purposes).

Can Word of Recall teleport through planes of existence?

Word of Recall is a 6th level Cleric spell that states

You (…) teleport to a previously designated sanctuary.

It defines this sanctuary as

(…) a location, such as a temple, dedicated to or strongly linked to your deity.

The text of the spell says nothing about interplanar travel, however we have other spells to look at for reference:

  • Teleportation Circle is a 5th level spell that opens a short-lived portal to a predetermined prepared location on the same plane of existence;
  • Teleport is a 7th level spell that doesn’t allow planar travel, and can be inaccurate depending on the caster’s familiarity with the target location;
  • Plane Shift, also a 7th level spell, is designed for planar travel, but seems somewhat inaccurate, depending on DM fiat;

Teleportation Circle shares the most similarities with Word of Recall, requiring prior setup and a designated location prepared in advance. However both the Circle and Teleport require the target location to be on the same plane of existence, and Plane Shift can be inaccurate. I guess the single class limit of Word of Recall and the setup needed might balance the possibility of planar travel, but I’d rather not guess the design principles of the official rulemakers. Thus, the question:

Does Word of Recall allow for teleportation to a sanctuary that is on another plane of existence than the caster?

How do Ethereal objects/creatures work on the Outer planes?

The Ethereal doesn’t border the Outer Planes, and thus spells that allow you to access the Ethereal fail. However some creatures or objects have Ethereal parts to them. What happens to them?

For examples of how this situation can arise:

  • in one adventure set in the Outlands, there is a living trap of scorpions disguised as gold coins. The stingers are described as “Ethereal” even though it takes place on the Outlands. (Or was this detail a mistake?)

  • an Ethereal weapon or creature is forced through a portal

Does piety work across planes?

Mythic Odysseys of Theros introduces the concept of Piety:

The strength of your devotion to your god is measured by your piety score. As you increase that score, you gain blessings from your god.

Nowhere does it mention if this is limited to a character’s presence on the plane of Theros, where the gods reside.

While the source book doesn’t mention moving between planes, is there any indication that this piety stops if the characters leave that plane? I’m asking in the context of the Magic: the Gathering setting where interplanar travel is possible.

My default assumption is that it’s unspecified and possibly unanswerable, but I’m happy to be proven right/wrong.

Are the Material Planes comprising the various campaign settings surrounded by a shared set of outer planes?

I’m working on an extra-planar supplement for DM’s Guild, and it got me wondering:

Is the 5e cosmological model that the material planes are comprised of all DnD settings, official and otherwise (Forgotten Realms, Eberron, and other published or future campaign worlds), surrounded by the outer planes which are common to all of them?

If this is the case, would that mean that the outer planes are comprised of souls from realms other than the players’ native world? Would a party who ventures there meet souls originally from Eberron, Athas, Greyhawk, etc.?

On the other hand, it’s possible I’m confusing my editions, and in 5e each campaign world has its own greater cosmology. In that case, are the outer planes unique to the Forgotten Realms, and does Eberron, for example, have its own set of outer planes?

Are there symbols representing the Feywild, the Shadowfell, elemental planes?

Are there symbols representing the Feywild, the Shadowfell, elemental planes? The player’s handbook of the 5th edition contains symbols for outer planes, are there symbols that represent the above planes of existence?

The symbol of the Feywild is of top interest. Perhaps there are any text descriptions?