Hello…

I have a little issue with the nature of the Battlespire…

If I read TIL I find this…
the Battlespire, an artificial pocket of existence in the Void — http://www.imperial-library.info/content/pocket-guide-nature-places-not-here…
the Imperial Battlemage war college, the Battlespire, (Which is in a pocket dimension in Oblivion.) — http://www.imperial-library.info/content/weir-gate…

Ok, a "pocket dimension in Oblivion", but no source, cool…

Now I read UESP…
The realm of Battlespire, the magical academy of the battlemages, is located in a thin slipstream between http://uesp.net/wiki/Lore:Planes_of_Oblivion and http://uesp.net/wiki/Lore:Mundus.

Now it's a "pocket dimension between Oblivion and Mundus"…
It's not the same thing, but no source again…


Now I want to laugh and I read Wiki…
The Imperial Battlespire was an academy for the http://elderscrolls.wikia.com/wiki/Mages_Guild. It was built using the help of several Daedric Lords, including http://elderscrolls.wikia.com/wiki/Azura and http://elderscrolls.wikia.com/wiki/Mehrunes_Dagon.

That's funny…!
No source again…


Everyone says that Battlespire is a "pocket dimension somewhere"…
But no source…

If I read http://xtes.ru/index.php?name=downloads&op=down&id=372&f=0 (7zip archive) I don't find any mention about any "pocket dimension"…
I've play a little to Battlespire and I never read this statement in game…
Only Clarentavius says this : Where are the legions, to cleanse this realm of its infestation?
English is not my native language, but I thought that "realm" word can have different meaning, no…?



In http://www.imperial-library.info/content/doors-oblivion :
We had hopes of using the ruins of the Battlespire to access Oblivion.

If I understand well the logic of this sentence, Battlespire isn't a part of Oblivion…


Now we have the expended universe with MK's works…
http://www.imperial-library.info/content/tiber-septim%E2%80%99s-sword-meeting-cyrus-restless…
And then there’s the matter of a Battlespire stuck into the southern side of the moon, as if Masser were about to play the flute.
Whereas the Master of the TEM Battlespire Honor Before Glory, Celeus Fallbright, Knight-Commander of the Ruby Armada, Admiral of the Dragon Banner at Void and Commander in Chief of His Majesty's Ships and Vessels employed and to be employed in the Lanes Aetherial & Mnemolic, etc., etc., etc.,
You are now appointed as the new commander of the TEM Battlespire Utmost Triumph to secure in irons real and unreal, the vagrant Redguard terror Sura-do-Hega, 'Cyrus' in the Cyrodilic, 'The Maverick King of the Alk'r' in quarters vulgar, base, and tavern-fanciful--
Be advised, if reports are true, the Carrick and its captain have destroyed both the TEM Honor Before Glory and TEM Longbow, Sunbird of Alinor.

We have:
-There is several Battlespires…
-Theses Battlespires can move into the Oblivion…
-Theses Battlespires are on the same level of a Sunbird…

So…
Battlespire seems to be an orbital station or a huge spaceship…
Now question is : a spaceship is a "pocket dimension"…?

Battlespire is in Oblivion and UESP does provide a source of sorts. Although they don't need to because the information comes in-game.

Battlespire could only be accesed through the Weir Gate, which was a portal to Oblivion. If the game wasn't proof enough for you, read this book:http: //uesp.net/wiki/Lore:The_Doors_of_Oblivion


And it can only be a pocket realm (like Soul Cairn, Umbriel, ect.) because it isn't one of the main realms.

Lady Freyja addressed the Doors of Oblivion. Based on her interpetation of the passage, the Weir Gate does not go to Oblivion and the Battlespire is not in Oblivion. (The phrase "using the ruins of the Battlespire to access Oblivion" would suggest that the Battlespire does not count as being within Oblivion itself) Rather, Morian Zenas hoped to reach actual planes of Oblivion using the same tactic the Battlespire hero used to steal his way into the Soul Cairn.

Of notable relevance to Freyja's point is that a dragon can apparently fly from the Battlespire to the Imperial City, and the Battlespire itself was shown as being within Nirn's atmosphere.

Okay, this takes a bit of reading between the lines. I think it may straddle the line between being in a pocket of Oblivion being between realms. Now, looking at Doors of Oblivion first (linked above) as well as the game's plot, it seems to be a point where it is particularly easy to access Oblivion from Mundus and vice-versa. This points to it being between realms (literally and figuratively, as it is suspended in the sky between Nirn and Oblivion and is the location of several portals to and from these places)

(That was a bum sentence ignore it except for the "sword-meeting Imperial Space Stations" part). That, plus dialog in Battlespire (OP linked to it) suggests that it is both a conduit between locations and a location itself, much as the Soul Cairn is a mini-realm of Oblivion.

In any case, the Battlespire(s) were artifacts of incredible power and the Empire is much the worse off for losing them, especially against the modern Dominion.

Umbriel was a piece of Oblivion that was ripped out and sent to Nirn....

It was present in Nirn's "atmosphere" (if such a word even makes sense in TES metaphysics.) It was described as a "bubble." Being at once in the Mundus and still part of Oblivion.

We know that cast of pieces of creatia (Aetherial matter) are used to make things (towers, tower stone, Weklynd stones, Varla stones) so perhaps the Battlespire is a cast off piece of creatia from Oblvion that was harnessed and used. It would explain why the Prince wanted it back.

Again, I'm not English native speaker…
So I can totally misunderstand this passage…


"Battlespire is like Umbriel", I like it…

In fact, in Battlespire, it was explained this…
I open the gate to the Prince, he comes in, cleans out the Battlespire

As if the BS has the same protection as Nirn against Oblivion invasion : it need someone for opening the door, like in Oblivion and even TESO…

So battlespire(s) seems to be a part of Mundus…?
And Sunbirds too, and every spaceship…?

Umbriel was contained within a chunk of Clavicus Vile, yes, but there are important differences between the Battlespire and Umbriel. One of which is that it was impossible for anyone to corporally leave Umbriel after spending enough time there. (We see a similar sort binding with the Soul Cairn) The Battlespire, by contrast, seems to have no effect on its long term residents. A dragon that was living in the stables of the Battlespire could fly to the Imperial City on a whim, unimpeded. Furthermore, there is nothing to suggest a daedric origin to the Battlespire.
The Game Battlespire never claims Dagon had it in the first place.

Instead, he was using it as a way to start an easy invasion, by not having cultists try hard, when there's a gate already to the Imperial City.

Is there any evidence of other groups having such powerful gateway hubs as the Batlespires? For instance, the Dwemer.

It's not because the master of the realm wants it so…?

That's how I read it too.

The inability to leave has nothing to do with Daedric or non-Daedric. Its because Umbra doesn't want anyone to leave. The realm is under his complete control.