The earliest character sheet for the game that inspired Dungeons & Dragons includes 8 character traits: Brains, Looks, Credibility, Sex, Health, Strength, Courage, and Cunning. The character comes from Dave Arneson’s Blackmoor campaign, which launched in 1971. See A History of D&D in 12 Treasures from author Jon Peterson.

The sheet organizes these traits under the heading, “Personality,” and measures of personality dominate the list more than abilities like strength and health. The Blackmoor campaign represented Charisma with three scores—Credibility, Looks, and Sex, as in “sexual prowess.”

Blackmoor evolved from miniature wargame campaigns. These games only represented individuals when they served as commanders for military units or as leaders of countries. When the referee needed to determine how well a commander followed orders or honored an alliance, measures of personality such as courage and loyalty mattered. One early campaign adopted a system for generating life events such as marriages and sickness for important characters. You can imagine how health and even sexual prowess could factor in such a game. Abilities like strength never figured in play.

Blackmoor started with players controlling single characters who would act in political intrigue and as leaders in battle, so the game emphasized traits for personality and leadership. The characters could fight solo or learn magic, so Strength, Health, and Brains found a place in the game.

In the Blackmoor campaign, Dave used ability scores as the basis of tests that resemble modern saving throws or ability checks. “Players would roll against a trait, Strength for example, to see if they were successful at an attempt,” writes Blackmoor scholar D. H. Boggs. For example, on page 28 of The First Fantasy Campaign (1977), Dave describes how characters had to roll under their Dexterity score to remove their armor before drowning in Blackmoor Bay.

That example cites D&D’s Dexterity attribute, a score the original Blackmoor characters lacked. If Dave and his players used ability scores for saves, how did the rules omit a score for dodging? For his game, Dave also borrowed the saving throw categories from Chainmail—a 1971 set of rules for miniature-figure battles. Boggs speculates that these types for Dragon Breath, Spider Poison, Basilisk Gaze, and Spells covered enough cases to make a Dexterity attribute unnecessary.

How did Blackmoor’s personality traits turn into D&D’s six ability scores?

In 1972, Dave introduced his Blackmoor campaign to Gary Gygax, the author of Chainmail. Dave’s game transformed bits of Chainmail into something new and irresistible—something that broadly resembled D&D.

Based on Dave’s demonstration, feedback, and notes, Gary added his own contributions to make the D&D game that reached print. Dave recalled that Gary and his Lake Geneva group “had a lot more spare time than I did and they had a lot of ideas, so they came up with their own version of the rules.”

In the case of ability scores, Gary reworked the Blackmoor attributes into D&D’s. For example, Gary never favored simple, informal terminology like “Brains” and “Health,” so he opted for Intelligence and Constitution.

Gary consolidated Credibility, Looks, and Sex into Charisma. (Later, Unearthed Arcana and other roleplaying games would experiment with splitting Charisma back into traits for charm and beauty.)

Gary’s early games paired players with gangs of followers, so Charisma helped recruitment and retention. As play styles turned away from henchmen and hirelings, Charisma became less important. The 1977 Basic Set provided no rules crunch for Charisma.

On the Blackmoor character sheet, Cunning looks like a late addition. In both Dave and Gary’s pre-D&D campaigns, Cunning became the prime requisite for clerics. “Cunning” suggests a faith-healing charlatan more than a priest who’s spells worked. Still, the first cleric character, as played by Mike Carr in Dave’s Blackmoor game, had working spells. So eventually Cunning turned to Wisdom and became a measure of spirituality.

Unlike fighters, wizards, and thieves, the cleric lacks a clear archetype in the fantasy tales that inspired D&D. Instead, the class draws inspiration from bits of Christian priest and crusader, from Friar Tuck and Van Helsing. These clerics made an awkward fit in the pulp-fantasy world of D&D and lacked a place in other games. In 1975, when TSR adapted the D&D rules to different settings to create Metamorphosis Alpha and Empire of the Petal Throne, the games dropped clerics and their Wisdom attribute.

Instead designers saw a need to measure a character’s mental toughness with a sort of mental counterpart to Strength and Constitution. Metamorphosis Alpha swaps Wisdom for Mental Resistance. Empire of the Petal Throne replaces Wisdom with Psychic Strength.

Apparently, these games led Gary to see a need for a similar rating for D&D characters. Instead of adding a new attribute, Gary broadened Wisdom to include willpower. The Advanced Dungeons & Dragons Player’s Handbook grants characters with high wisdom a bonus to saves against “mental attack forms involving will force.” Only a strained definition of wisdom includes willpower, but until then Wisdom only served clerics. The broader scope gave Wisdom similar weight to the other attributes.

Years later, Wisdom would gain an association with perception. Games without Wisdom tend to associate perception with Intelligence.

Dexterity arrived to the game last. Gary must have felt that Strength needed a counterpart for characters wielding crossbows, so Dexterity showed aptitude for ranged weapons. After the original books reached the public, the Thief entered the game and took Dexterity as a prime requisite.

Even though the original D&D release turned the scores from measures of personality into measures of ability, the game still says that the scores aid players “in selecting a role” like one of those personality tests that help students select a career.

When Gary wrote D&D, he never explained how to use ability scores for checks. In his own game, Gary preferred a loose method where he decided on a character’s chance of success and improvised a die roll to match. For saves, Gary just elaborated on the system from the Chainmail rules.

So according to D&D’s original rules, ability scores counted for little. The abilities barely deliver any game effects: At most a +1 to hit or an extra hit point per die.

These slight effects mean that early D&D characters in the same class all played much the same. But ability scores ranging from 3 to 18 seemed to promise bigger game effects than a mere +1. With the release of the Greyhawk supplement in 1975, Gary began linking more game effects to the scores: High strength meant more damage, high Wisdom and Intelligence yielded more spells, and so on.

With that development, D&D started down the road to the modern game, which builds on ability scores as the foundation for every check and save.

Related:
The awkward role of Wisdom in fantasy role playing.

Ability Checks—From the Worst Mechanic in Role-Playing Game History to a Foundation Of D&D

For 25 Years, D&D Put Saving Throws In Groups Made For Just 3 Creatures and 2 Spells