[Sqwonk]

Skyrn’s Chain
The chain is 20 ft long w/ thick 4 inch links. It works similar to the spell Rope Trick.
Command word: upseedaisy

One end of the chain rises into the air until the whole chain hangs perpendicular to the ground, as if affixed at the upper end. The upper end is, in fact, fastened to an extradimensional space that is outside the multiverse of extradimensional spaces (“planes”). Creatures in the extradimensional space are hidden, beyond the reach of spells (including divinations), unless those spells work across planes.

The space holds as many as 10 creatures (medium size). Creatures in the space can pull the chain up into the space, making the chain “disappear.” In that case, the chain counts as one of the 10 creatures that can fit in the space. The chain can be climbed by only one person at a time.

The space lasts for 10 hours or until commanded to close. It can only be activated once per day. Anything inside the extradimensional space drops out when the duration ends.

The chain can support up to 20,000 pounds. A weight greater than that can pull the chain free.

Spells cannot be cast across the extradimensional interface, nor can area effects cross it. Those in the extradimensional space can see out of it as if a 3-foot by 5-foot window were centered on the chain. The window is present on the Material Plane, but it’s invisible, and even creatures that can see the window can’t see through it.