Special Rules (Spelljammer Supplement)
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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
A creature the leave the air envelope of a ship, asteroid or planet can survive for a number of rounds equal to its constitution modifier(minimum of 1 round).
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. Template:5E Spelljammer Breadcrumb