Dead Star
A burnt-out stellar remnant that still holds a system in orbit but no longer lights it. Charts mark them and traffic avoids them, because a comms blackout at that range looks the same as a disappearance.
Exposure
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Gravity above about 1.5g, where objects and creatures weigh more and falling damage is doubled.
CON save, DC 12. End of each hour of exertion. One level of exhaustion.
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Weight
Carrying capacity is halved, and a creature's speed is reduced by 10 feet.
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Falls
Falling damage is doubled, and a fall of 10 feet or more knocks a creature Prone with no save.
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Ranged weapons
The long range of any thrown or ballistic weapon is halved.
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Adapted
A creature native to a high-gravity world, or one with a feature naming gravity, ignores all of the above.
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In play
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No light
Sight beyond Close range requires a carried light source, because no ambient light reaches or reflects off anything here.
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No signal
Comms do not leave the well. A vessel inside is out of contact for as long as it stays.
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Orbits
The remnant's mass is unchanged, so all bodies that orbited the star still orbit it, in the dark.
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Ionizing dose
Unshielded, a creature gains a level of exhaustion each hour. A long rest does not clear it. A Medicine check at DC 12, a restorative spell or antiradiation drugs remove it. Rated shielding removes the effect, and most powered plate raises the interval to four hours.