[3.5] Extradimensional Room Item/Teleporting item (Need Help)

[D4rkh0rus]

Is there such an item that creates an extradimensional room? Say for example a Key that when used with any door, that door opens up into a specific room (say like a rope trick space) thats permanent (as in you can leave stuff inside and it wont just dissapear or anything once you take out the key)?
(Its basically my desire to make a sort of "Portable Workshop" for an artificer.)

Or if that is impossible, is there such an item that when used teleports you to a specific location, and when used again teleports you back to where you were?

[jiriku]

The rules are a little hazy on it, but when you create a demiplane (such as with the genesis spell) you should be able to specify how it is accessed, for example by linking it to a standing portal of some kind or keying it to a particular object like a cubic gate or well of many worlds. Manual of the Planes has details, such as they are.

[D4rkh0rus]

But, Is creating an entire demiplane the only way to do this? Its only for a room. *looks out window* *large expanse of grass* *wonders why nothing else is being used. huh...*

[Bronk]

Is there such an item that creates an extradimensional room? Say for example a Key that when used with any door, that door opens up into a specific room (say like a rope trick space) thats permanent (as in you can leave stuff inside and it wont just dissapear or anything once you take out the key)?
(Its basically my desire to make a sort of "Portable Workshop" for an artificer.)

Or if that is impossible, is there such an item that when used teleports you to a specific location, and when used again teleports you back to where you were?

In 3.5 'portable hole' would get pretty close to this (minus the key part), and an 'enveloping pit' would do the same but with a larger room.

If you go back to Spelljammer though, you could use the 'Hold of Holding', which exactly fits your desire... you have a magic door knocker that you can put on any door to open it up into your (rather large - it holds tons) extradimensional space. (Spelljammer: War Captain's Companion, Book 1)

[KingSmitty]

The secret chest spell would be the closest i can think of...a wondrous item of secret chest or portable hole is closest. But most custom magic items are whatever u want as long as you're willing to pay in our games and can find a spell or spells that are close to what you want