Attributes

PHYSICAL ATTRIBUTES -- base 10, cannot be negative
Might (Mig): Measures the ability to exert physical force. Might increases muscle tone, carrying capacity, and damage dealt with most weapons. It also has a small effect on Stamina.
Agility (Agi): Measures fine muscle control and the ability to coordinate actions and thoughts. Agility affects manual dexterity, hand-eye coordination, and the ability to multi-task effectively. It also has a small effect on Concentration.
Speed (Spd): Measures the ability to move quickly. Speed affects your movement speed, attack speed, and reflexes.
Toughness (Tuf): Measures vitality and durability. Toughness affects muscle tone and resistance to poisons and diseases. It also has a large effect on Health.
Endurance (End): Measures the ability to withstand sustained exertion. Endurance affects the amount of time you can hold your breath and how quickly you become fatigued and exhausted. It also has a large effect on Stamina and a small effect on Health.

MENTAL ATTRIBUTES -- base 10, cannot be negative
Senses (Sen): Measures the refinement and sensitivity of all senses. Senses affects every sense available to a character, but only in proportion to the baseline. A human with high Senses is still going to have a worse sense of smell than a dog with average Senses.
Logic (Log): Measures rational thought and the ability to process complex ideas. Affects spell power with some types of magic and improves the effects of certain scholarly skills. It also has a small effect on Concentration.
Intuition (Int): Measures instinct and the ability to make connections subconsciously. Affects spell power with some types of magic and improves the effects of a wide array of skills.
Willpower (Wil): Measures the ability to resist distraction and temptation. Improves the ability to cast difficult spells. Also has a large effect on Concentration and a small effect on Health and Stamina.
Charisma (Cha): Force of personality and ability to impose one’s will upon another. Affects spell power with some types of magic and improves the effect of skills involving interpersonal relations.

SPECIAL ATTRIBUTES -- base 0, can be positive or negative
Attractiveness (Atr): Measures physical appearance and sexual attractiveness. This is not magic and even a truly mind-boggling score will not make you attractive to someone who would not otherwise be attracted to you. A racist Human who finds non-Humans totally disgusting will not be sexually attracted to anyone of another race, regardless of their Attractiveness score, as an example.
Luck (Luc): Measures the ability to unconsciously bend the universe to your will. This has an effect on almost everything.

DERIVED ATTRIBUTES -- derived purely from other factors, can’t be directly changed with level up points
Health: The amount of physical damage which can be sustained before risking death. Health is equal to (CLvl x 10 + Tuf x 5 + End x 1.5 + Wil x 1.5 + Luc) x Multipliers, rounded up.
Stamina: The amount of physical exertion possible before becoming exhausted. Stamina is equal to (CLvl x 20 + End x 10 + Wil x 2 + Mig x 2 + Luc) x Multipliers, rounded up.
Concentration: The amount of mental exertion possible before becoming dazed. Concentration is equal to (CLvl x 5 + Wil x 5 + Log x 1.5 + Agi x 1.5 + Luc) x Multipliers, rounded up.

HIDDEN ATTRIBUTES -- not normally displayed to users and cannot be directly affected by them
Mental Capacity: Measures raw intelligence and processing power.
Psyche: The amount of mental and emotional damage which can be sustained before risking insanity. Psyche is equal to (10 + Wil x 2 + Cha + End x 0.5 + Luc x 0.5) x Multipliers, rounded down.