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Gravity Traits

Source GameMastery Guide pg. 184
The direction of gravity’s pull may be unusual, and it might even change directions within the plane itself.

Normal Gravity: Most planes have gravity similar to that of the Material Plane. The usual rules for ability scores, carrying capacity, and encumbrance apply. Unless otherwise noted in a plane’s description, assume that it has the normal gravity trait.

Heavy Gravity: The gravity on a plane with this trait is much more intense than on the Material Plane. As a result, Acrobatics, Climb, Ride, and Swim checks incur a –2 circumstance penalty, as do all attack rolls. All item weights are effectively doubled, which might affect a character’s speed. Weapon ranges are halved. A character’s Strength and Dexterity scores are not affected. Characters that fall on a heavy gravity plane take 1d10 points of damage for each 10 feet fallen, to a maximum of 20d10 points of damage.

Light Gravity: The gravity on a plane with this trait is less intense than on the Material Plane. As a result, creatures find that they can lift more. Characters on a plane with the light gravity trait take a +2 circumstance bonus on attack rolls and on Acrobatics and Ride checks. All items weigh half as much, and weapon ranges double. Strength and Dexterity don’t change as a result of light gravity, but what you can do with such scores does change. These advantages apply to travelers from other planes as well as natives. Falling characters on a light gravity plane take 1d4 points of damage for each 10 feet fallen (maximum 20d4).

No Gravity: Individuals on a plane with this trait merely float in space, unless other resources are available to provide a direction for gravity’s pull.

Objective Directional Gravity: The strength of gravity on a plane with this trait is the same as on the Material Plane, but the direction is not the traditional “down” toward the ground. It may be down toward any solid object, at an angle to the surface of the plane itself, or even upward. In addition, the direction of “down” may vary from place to place within the plane.

Subjective Directional Gravity: The strength of gravity on a plane with this trait is the same as on the Material Plane, but each individual chooses the direction of gravity’s pull. Such a plane has no gravity for unattended objects and nonsentient creatures. This sort of environment can be very disorienting to the newcomer, but it is common on “weightless” planes.

Characters on a plane with subjective directional gravity can move normally along a solid surface by imagining “down” near their feet. If suspended in midair, a character “flies” by merely choosing a “down” direction and “falling” that way. Under such a procedure, an individual “falls” 150 feet in the first round and 300 feet in each succeeding round. Movement is straight-line only. In order to stop, one has to slow one’s movement by changing the designated “down” direction (again, moving 150 feet in the new direction in the first round and 300 feet per round thereafter).

It takes a DC 16 Wisdom check to set a new direction of gravity as a free action; this check can be made once per round. Any character who fails this Wisdom check in successive rounds receives a +6 bonus on subsequent checks until he or she succeeds.