Environments · Extraplanetary

Lagrange Point

Points where the gravity of a world and its star, or a world and its moon, balance so that a station holds position without spending fuel. There are five per pair, and two of them are stable. Those two are the most valuable real estate in any system.

Extraplanetary

Exposure

  • Vacuum

    No pressure and no air to breathe, with survival measured in rounds.

    • Countdown

      Without a seal, a creature holds out for a number of rounds equal to its Constitution modifier, minimum 1. At the end of that time its hit points drop to -1, unless they are already lower, and it is dying. It cannot be stabilized or regain hit points until it can breathe.

    • Decompressed

      Exposure inflicts the Decompressed condition, which a return to pressure does not by itself remove.

    • Holding your breath

      Holding a breath in vacuum ruptures the lungs. A creature that does so takes 2d6 damage on the first round and gains no benefit from the attempt.

    • Sound

      Sound does not travel. Verbal spell components, shouted orders and Perception by hearing all fail across open vacuum. Suit comms and touch are the only channels.

    • Unfiltered light

      Without air to filter it, the star's output arrives unreduced. An hour of unshielded exposure in direct sunlight counts as a failed Contaminated Atmosphere save against radiological dose.

  • Zero Gravity

    Free fall, where there is no down, no moving body stops on its own, and a missed handhold leaves a creature adrift.

    • Movement

      Moving requires a surface to push from. A creature with nothing in reach continues in the direction it last moved until it reaches something.

    • Changing course

      Changing direction mid-drift requires a DC 12 Dexterity (Acrobatics) check. On a failure the creature continues as it was.

    • Melee

      An unanchored melee attack has disadvantage and pushes the attacker 10 feet away from the target after it resolves.

    • No falling

      There is no up, no down and no falling damage. A creature cannot be knocked Prone, and the Prone condition does not apply.

    • Mag boots

      Magnetic boots or a tether remove every entry above while a ferrous surface is underfoot, at the cost of half movement.

In play

  • Free station

    No fuel is spent holding position. Every long-term installation that is not in orbit of a body is at a Lagrange point.

  • Crowded

    The stable points collect dust, asteroids and every parked or abandoned object. Sensor checks there have disadvantage because of the clutter.

  • Jurisdiction

    A Lagrange point belongs to whoever holds the world, and claims to it are contested more often than the world is.

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