Gaseous form

Gaseous form or wraithform (originally called Quantoul's wraithmorph) is an arcane transmutation spell that mimick the supernatural ability of some creatures, (e.g., oni mages, several types of genie, and vampires) to take on an insubstantial, misty form. It is also a divine power granted to clerics of deities with power over the air and to druids who are members of the Underdark circle.

Effect

The subject of the spell and all his or her possessions, upon being touched, were converted into a translucent cloud of gas. Someone in a gaseous form could move through the air, but could not pass through solid objects or water—one did not become incorporeal. Gaseous forms could flow through tiny holes or cracks, however. One in gaseous form could not do anything a literal cloud of gas could not also do. It was very hard to physically damage a creature in gaseous form without the use of magic weapons. It was also challenging to recognize that a gaseous form was not just a simple mist.
The effect of the spell would last ten minutes or longer.
The spell usually only worked on a creature; however, it also could be used to convert a star ruby into a cloud of red vapor that had special healing powers, provided that the gem had been "unlocked" first with a knock spell.

Discovery

The spell was invented by the Netherese arcanist Quantoul in −2019 BC as one of his many investigations into the variator arts.

Material Components

The subject of the spell and all his or her possessions, upon being touched, were converted into a translucent cloud of gas.[3] Someone in a gaseous form could move through the air, but could not pass through solid objects or water—one did not become incorporeal. Gaseous forms could flow through tiny holes or cracks, however. One in gaseous form could not do anything a literal cloud of gas could not also do.[3][19] It was very hard to physically damage a creature in gaseous form without the use of magic weapons. It was also challenging to recognize that a gaseous form was not just a simple mist.[3][19]
The effect of the spell would last ten minutes or longer.[3]
The spell usually only worked on a creature; however, it also could be used to convert a star ruby into a cloud of red vapor that had special healing powers, provided that the gem had been "unlocked" first with a knock spell.[20]