- Strength (ST): Strength is a character's physical prowess and bulk. It determines how much a character can lift, how much they can carry, how much damage they do in unarmed combat or with weapons like swords and axes, and how much damage they can take.
- Dexterity (DX): Dexterity is a combination of agility, coordination, and fine motor skill. It is the key attribute for most athletic, combat, crafting, and other skills involving physical activity. Dexterity also goes into determining a character's Basic Speed and Basic Move.
- Intelligence (IQ): Intelligence measures a character's brainpower, broadly including creativity, perception, intuition, memory, and other mental abilities. It is the key ability for science, engineering, social interaction, and any other skill involving mental capability. In campaigns that use magic, it is the key ability for magic skills. Intelligence also determines a character's Will and Perception.
- Health (HT): Health represents a character's stamina, resilience, resistance to poisons, diseases, and other ill-effects. Health determines a character's Fatigue, and goes into calculating their Basic Move and Basic Speed.
- Damage: This is based on a character's ST, and comes in two flavors - thrusting damage, which measures the damage the character does with a punch, kick, or rapier, and swinging damage, which measures the damage the character does with a swinging weapon like an axe or club. For example, a ST 10 character does 1d6-2 damage, so if they punched someone and connected, they would roll 1d6 and subtract 2 for their damage. If that same character was using a spear, which has listed damage of "thrust+2", then the character would roll 1d6 on a successful hit.
- Basic Lift: This is based on ST and measures how much weight a character can lift over their head with one hand in one second. This value is used to determine how much a character can carry before becoming encumbered. The basic lift for a human with ST 10 is 20 pounds.
- Hit Points: This is based on ST and represents how much damage a character can take before becoming unconscious or dying. Effectively, a character has as many hit points as their ST score.
- Will: Will is based on IQ and represents a character's ability to resist mental stress including fear, hypnotism, seduction, torture, and so on. In the Traveller setting, it is important to note that Will is used to resist psionic influence. In a fantasy setting, Will is used to resist some magical effects.
- Perception: Perception is based on IQ and represents a character's general alertness.
- Fatigue Points: Fatigue Points are based on HT, and represents a character's "energy supply". A character expends Fatigue points when they engage in strenuous activity. Disease, heat, hunger, and other similar issues can sap a character's Fatigue Points as well. Losing Fatigue Points can slow a character down or cause them to fall unconscious. In extreme cases, loss of Fatigue Points can result in death from overexertion.
- Basic Speed: Basic Speed is determined by a combination of a character's DX and HT, and measures a character's reflexes and physical quickness. Initiative in combat is based on a character's Basic Speed, as is a character's ability to dodge attacks.
- Basic Move: Basic Move is based upon a character's Basic Speed and represents how many yards a character can move in one second. Encumbrance can modify a character's Move.
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