Rules Index | GM Screen

Planar Traits

Source GameMastery Guide pg. 184
Each plane of existence has its own properties—the natural laws of its universe. Planar traits are broken down into a number of general areas. All planes have the following kinds of traits.

Physical Traits: These traits determine the laws of physics and nature on the plane, including how gravity and time function.

Elemental and Energy Traits: The dominance of particular elemental or energy forces is determined by these traits.

Alignment Traits: Just as characters may be lawful neutral or chaotic good, many planes are tied to a particular morality or ethos.

Magic Traits: Magic works differently from plane to plane; magic traits set the boundaries for what magic can and can’t do on each plane.

Physical Traits

Source GameMastery Guide pg. 184
The two most important natural laws set by physical traits are how gravity works and how time passes. Other physical traits pertain to the size and shape of a plane and how easily a plane’s nature can be altered.

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.

Time Traits

Source GameMastery Guide pg. 185
The rate at which time passes can vary on different planes, though it remains constant within any particular plane. Time is always subjective for the viewer. The same subjectivity applies to various planes. Travelers may discover that they gain or lose time while moving between planes, but from their point of view, time always passes naturally.

Normal Time: Describes how time passes on the Material Plane. One hour on a plane with normal time equals 1 hour on the Material Plane. Unless otherwise noted in a plane's description, assume it has the normal time trait.

Erratic Time: Some planes have time that slows down and speeds up, so an individual may lose or gain time as he moves between such planes and any others. To the denizens of such a plane, time flows naturally and the shift is unnoticed. The following is provided as an example.

d%	Time of Material Plane	Time on Erratic Time Plane
01-10	1 day	1 round
11-40	1 day	1 hour
41-60	1 day	1 day
61-90	1 hour	1 day
91-100	1 round	1 day

Flowing Time: On some planes, the flow of time is consistently faster or slower. One may travel to another plane, spend a year there, and then return to the Material Plane to find that only 6 seconds have elapsed. Everything on the plane returned to is only a few seconds older. But for that traveler and the items, spells, and effects working on him, that year away was entirely real. When designating how time works on planes with flowing time, put the Material Plane's flow of time first, followed by the flow in the other plane.

Timeless: On planes with this trait, time still passes, but the effects of time are diminished. How the timeless trait affects certain activities or conditions such as hunger, thirst, aging, the effects of poison, and healing varies from plane to plane. The danger of a timeless plane is that once an individual leaves such a plane for one where time flows normally, conditions such as hunger and aging occur retroactively. If a plane is timeless with respect to magic, any spell cast with a noninstantaneous duration is permanent until dispelled.

Shape and Size Traits

Source GameMastery Guide pg. 185
Planes come in a variety of sizes and shapes. Most planes are infinite, or at least so large that they may as well be infinite.

Infinite: Planes with this trait go on forever, though they may have finite components within them. Alternatively, they may consist of ongoing expanses in two directions, like a map that stretches out infinitely. Unless otherwise noted in its description, assume that a plane is effectively infinite.

Finite Shape: A plane with this trait has defined edges or borders. These borders may adjoin other planes or be hard, finite borders such as the edge of the world or a great wall. Demiplanes are often finite.

Self-Contained Shape: On planes with this trait, the borders wrap in on themselves, depositing the traveler on the other side of the map. Some spherical planes are examples of self-contained, finite planes, but they can also be cubes, tori, or flat expanses with magical edges that teleport the traveler to the opposite edge when she crosses them. Some demiplanes are self-contained.

Morphic Traits

Source GameMastery Guide pg. 186
This trait measures how easily the basic nature of a plane can be changed. Some planes are responsive to sentient thought, while some respond to physical or magical efforts. Others can only be manipulated by extremely powerful creatures.

Alterable Morphic: On a plane with this trait, objects remain where they are (and what they are) unless affected by physical force or magic. You can change the immediate environment as a result of tangible effort. Unless otherwise noted in a plane’s description, assume it has the alterable morphic trait.

Divinely Morphic: Specific unique beings (deities or similar great powers) have the ability to alter objects, creatures, and the landscape on planes with this trait. They may cause these areas to change instantly and dramatically, creating great kingdoms for themselves. Ordinary characters find these planes similar to alterable planes in that they may be affected by spells and physical effort.

Highly Morphic: On a plane with this trait, features of the plane change so frequently that it’s difficult to keep a particular area stable. Some such planes may react dramatically to specific spells, sentient thought, or the force of will. Others change for no reason.

Magically Morphic: Specific spells can alter the basic material of a plane with this trait.

Sentient: These planes respond to a single entity’s thoughts—those of the plane itself. Travelers might find the plane’s landscape changing as a result of what the plane thinks of the travelers, becoming either more or less hospitable depending on its reaction.

Static: These planes are unchanging. Visitors cannot affect living residents of the plane or objects that the denizens possess. Any spells that would affect those on the plane have no effect unless the plane’s static trait is somehow removed or suppressed. Spells cast before entering a plane with the static trait remain in effect, however. Even moving an unattended object within a static plane requires a DC 16 Strength check. Particularly heavy objects may be impossible to move.