Death said:
What about building a portal on a wagon and adventure with your own portal? Doesn't it sound a bit strange? Perhaps players would find a portal to some hidden underground place, decide, that this place would be fine hideout and try to bring outer portal with them...
They can remove floor too...
Nothing built into a wagon is truly "immobile". Now, if the wagon is a steam-driven, ninety-ton adamantium MONSTROUSITY ... maybe. Just maybe.
IMO, the concept of "immobile" means, you cannot EASILY transport it, wihtout disassembling it ... which essentially means, you have to BREAK it.
Broken magic items don't tend to work.
mkletch said:
But what if some creature of colossal+ size (like the mithril golem from Scarred Lands) came and moved the room?! I agree, the room is the key. Since teleport is really the base spell (via TwoE), it cares about the description/surroundings. I would probably even rule that, if you moved the portal and put it in a near-replica of the original location, that would probably work, too.
If something that big came along, then, it could move the portal just fine -- if the portal is constructed of material strong enough to be manhandled (golemhandled?) without breaking. If the portal is made of unmortared stone blocks, then, carrying it as a single piece (read: picking it up without it falling to pieces, also known as becoming broken and thus, nonfunctional) will be next to impossible.
Note, anything big enough topick a Portal up and walk away with it, is NOT
small enough to go THROUGH the portal ... so, a Portal that functioned for sicha being, would be truly IMMENSE, perhaps beyond belief! To illustrate this, take a baseball cap that fits your head. Cut the top off, so you have only the sides -- a nice, circular loop of cloth.
Now, climb through that loop. Go on; I
defy you to.
You are the collossal+ sized creature, and that loop of cloth is the Portal.
With great effort, and greater planning, and the investment of gp/xp to "repair" the protal, a portal should be disassemblable from it's original place, and re-assemblable in a new place. The advantages of doing so are few, however; yes, you get a half-price portal ... but you don't get to choose it's other end.
However, if you LIKE where it leads ... the "moved" portal might have features built-in, which you yourself are unable to craft into a portal yourself, just yet. And, as noted above, you get it for half price (not counting the large amount of labor needed to transport it, etc, etc).