Special Rules (Spelljammer Supplement)

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. Back to Main Page → 5e Homebrew → Spelljammer (5e Campaign Setting)

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