Hot-air balloon

Hot-Air Balloon A hot-air balloon was a type of flying vessel in which a small craft was lifted by a large balloon or sac.

Description
It operated on the principle of using a relatively small flame to heat the air inside the balloon, making it warmer and less dense than the air outside, which caused it to become buoyant and ascend.

Once off the ground, the balloon was driven by the winds, but a skilled pilot could apply some control. In strong winds they became harder to handle, and the pilot could even completely lose control, leading to catastrophe. Moreover, the balloons were fragile and could be punctured, causing a crash.

Carcerian Skin Balloons
In the Tarterian Depths of Carceri, hot-air balloons were considered an excellent method of traveling between the orbs that made up that plane. However, these balloons were fashioned from the hides and skins of Carceri's denizens, and rumors warned that unwise travelers were also used to patch some balloons. Some of the creatures that flew in the void naturally took offense at seeing their kind's skin being used so, and were apt to attack such balloons. A typical balloon carried two persons, but some could hold up to ten passengers.

History
According to gnomish legend, the god Nebelun the Meddler stole the tail of the lizardfolk god Semuanya while he was bathing, then skinned it and sewed it together, before inflating it with a massive set of bellows, creating a hot-air balloon. With a wicker basket lashed to the bottom, Nebelun flew it around for a while, failed to crash, and landed successfully, with the thing only exploding afterward. Thereafter, the lizard tail and bellows was the symbol of Nebelun, whose aspect on Toril was borrowed by Gond the Wonderbringer.

During the unplanned Great Modron March of the planes, a group of adventurers tried to track the modrons through Carceri and sought passage between the orbs to a portal. The Anarchist agent Aach offered them passage on her hot-air balloon, which was made from the skin of Carceri's petitioners. They followed the modrons to a portal to Undermountain.

In the, drow used a hot-air balloon made from spider silk in the shape of a massive arachnid as they evacuated from Ithimir Isle off the coast of Akanûl. Webs from the balloon carried a cocoon as big as a small house, in which was transported an arambarium mother lode. Alongside it, hundreds of spiders and giant spiders carried ettercaps and undead miners and deployed webs that were caught by the winds and pulled them into the air to follow the balloon. Their destination was a portal to the Demonweb Pits.