Rope Trick Bunker of Doom
The Spell
Rope Trick (Transmutation)
Level: Arcane 2
Components: V, S, M
Duration: 1 hour/level
Using a rope 5-30 feet long, the rope rise into the air until it totally stretches out, and the top end anchors to an extradimensional space (not part of the normal "planes"). Creatures who climb the rope and climb all the way to the top will pass through a 3'x5' invisible window to the extradimensional space, which can fit at most eight creatures (of any size) totalling no more than 16,000 pounds. Someone in the space can pull up the rope into the space, where the rope counts as one of the eight creatures limit.
Creatures in the extradimensional space can still see out of the window, but nobody can see in. Spells will not work across the window in either direction, including divinations, unless those spells work across planes. Anything in the extradimensional space when the spell ends will appear in-air and drop too the floor. Creatures who climb the rope can get off the rope in normal space at any height, they need not go all the way up or down.
Why is this a big deal
The spell creates a 3'x5' extradimensional space, centred on the rope, so it can be used to bypass thin doors and walls. The bigger use of this spell is to create impenetrable rest areas that require neither guards nor sleeping shifts, and which allow for parties to stop, prepare, and plan, even in the middle of an enemy's invincible doom fortress. The extradimensional space holds 8 people by default and lasts long enough for a full-night's sleep at 8th level (or 5th level with Extend Spell feat to use up a 3rd level spell slot), meaning the only difference between this and Magnificent Mansion is that this doesn't have butlers or food by default - and this is a 2nd Level Spell.
No Fun Allowed
- "Anything that can see invisible (don't forget the 2nd level spell) will see the dimensional window you opened. The DM will likely have an ambush waiting for you or if they have had enough of your bullshit, setup an ambush and cast dispel."