View source for Special Rules (5E Spelljammer Setting)

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===Gravity and Air===

All bodies of a sufficiently large size have gravity. This gravity usually (but not always) exerts a force equal to the standard gravitational attraction on the surface of an Earth-sized planetary body. Gravity in the Spelljammer universe is also an exceptionally convenient force, and almost always works such that "down" orients itself in a manner most humanoids would find sensible.

All bodies of any size carry with them an envelope of air whenever they leave the surface of a planet or other stellar object. Unlike real-world astrophysics, this air envelope is not dispersed by the vacuum of space. These bubbles of air provide breathable atmosphere for varying lengths of time, but 4 months is considered "standard".

==Magic in Space==
;Divine Magic in the Phlogiston
It is difficult for a cleric, paladin or druid to communicate with their deity or force of nature outside of a crystal sphere. 3rd-level or higher spells of these classes cannot be cast while in the phlogiston. 1st and 2nd-level spells can still be cast using higher level spell slots.

;Clerics in other Spheres
If a cleric's deity does not have an established group of worshippers somewhere within a crystal sphere, that cleric's spellcasting is limited as above.

;Interplanar Magic in the Phlogiston
The space between Spheres is severed from all other planes: inner, outer, ethereal or astral. As such, the following spells do not function in the Flow.
*''arcane gate''
*''astral projection''
*''blink''
*''conjure animals''
*''conjure celestial''
*''conjure elemental''
*''conjure fey''
*''conjure minor elementals''
*''conjure woodland beings''
*''contact other plane''
*''demiplane''
*''etherealness''
*''gate''
*''Leomund's secret chest''
*''Mordenkainen's magnificent mansion''
*''planar ally''
*''plane shift''
*''teleport''
*''teleportation circle''
*''transport via plants''
*''tree stride''
*''word of recall''

;Fire in Wildspace
Fire burns normally within the air bubbles of planets and ships, but not within the vacuum between them. 

Magical fire can be created in vacuum, so fire-based spells can still be cast, but they cannot be used to fire to objects.

;Fire in Phlogiston
Phlogiston is explosive, and air bubbles of ships are permeated with phlogiston.
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