Description:
A large glass jar with a blue jade lid, typically found heavily sealed with wax. The contents of the jar is pure whiteness and it glows faintly in deep darkness.
Magical Properties
This jar contains solid cloud which can be pulled out completely or in part to up to roughly 200'x200'x10' of volume. The cloud will not form thinner than 10' in any dimension. Should multiple jars be found the material can be combined. The cloud will not enclose solid objects when forming nor will it form anywhere save under the open sky.
The cloud is very buoyant and can support stone structures as tall as the cloud is thick. For purposes of taking damage, the cloud is as durable as hard stone and is unaffected by fire. Normal winds have no effect on the cloud. Powerful storms can affect objects and beings on the cloud, but not the cloud itself.
The being who removes the cloud from the jar is able to control the cloud mentally, which can move up to 10 mph with trivial loads (i.e adventuring party with horses,etc) and up to 3 miles per hour when permanent structures are built atop it. The clouds have a ceiling of 1 mile and can rise and descend at the same rate.
If the jars are lost or destroyed the cloud becomes free travelling and moves with the winds.
Origin:
Legend has it that this cloud is obtained by harvesting it from a particularly rare cloud formation on the Elemental plane of Air, and that location is especially hazardous due to a preponderance of dragons.
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? Responses (6)

Handy! How rare would such a thing be? With enough of these, you could make your own cloud castle. Have to be careful in handling those jars, though.

I'd leave that up for the DM of course :) And yes, one could omit the safeties such as being usable only outdoors and not being able to enclose things in rock-strong cloud. Then they become dangerous indeed.

Very useful.

I like the idea that the magic is tied to the jar itself. It leaves the implication that the cloud is trapped inside somehow. Maybe it's a nascent air elemental, just about to acheive consciousness?

I like this and am actually seeing a potential of twisting it slightly to make it a dark cloud to add to my game. The flavor of it will fit into the campaign easily. Something the villain is going to use to darken the sky and/or hide his fortress on the mountaintop by placing a cloud around the peak so his castle can't be seen from the base of the mountain.

Nice, I like the details