In 1974, Dungeons & Dragons introduced roleplaying games and—less significantly—dump stats where players set their least-useful ability to their lowest score. According to the original D&D rules, players rolled abilities in order. Actually, by the rules as written, “it is necessary for the referee to roll three six-sided dice in order,” but everyone let players roll instead. Innovations like point-buy character generation or even rearranging rolled scores were years away.

Still, original D&D had dump stats of a sort. Fighters could trade Intelligence for Strength, the fighter’s “prime requisite.” Clerics could trade Intelligence for Wisdom. Magic users could trade Wisdom for Intelligence. Every class came with at least one potential dump stat, and these exchanges cost 2 or 3 points for 1 point of the prime requisite. When I first read those offers, the exchange rates struck me as a bad deal. I was wrong. None of those classes gained anything from their dump stat, so the trades only benefited the characters. In the original rules, Strength, Intelligence, and Wisdom just brought advantages to the class that used the ability as a prime requisite. (Intelligence brought extra languages; few players cared.) The rules prevented players from reducing Constitution and Charisma, but those abilities could help every character with more hit points or more loyal followers.

In 1977, the hand-to-hand combat game Melee by American designer Steve Jackson showed a different and influential approach to ability scores. Melee used just two attributes, Strength and Dexterity, but the scores brought bigger mechanical effects than in D&D. Strength permitted more damaging weapons, stouter armor, and functioned as hit points. Dexterity determined to-hit rolls and who struck first. In this combat game, dueling characters needed to enter the battlefield evenly matched, so rather than rolling attributes, players bought them with points. Modern role-playing games virtually always let players build their characters, but in 1977 the point-buy system proved a massive innovation.

When I played Melee, I marveled at the balance between Strength and Dexterity. Every point moved between the two attributes traded a tangible benefit for a painful detriment, and the difficult choice between stats made character generation into a fascinating choice. Just as important, the simple choice led to fighters who played differently but who proved equally effective. No other game would ever feature such a precise balance between ability scores, but with 2 scores and just one character type, Melee’s narrow scope helped.

A magic system to accompany Melee appeared in Wizard (1978). This addition introduced a third stat, Intelligence, but wizards still needed Strength to power spells and Dexterity to cast them. Intelligence became a dump stat for the original game’s fighters, while wizards gained enough from spells to offset the need to invest in three stats. When Melee and Wizard became The Fantasy Trip roleplaying game, IQ also bought skills, so some balance between stats remained.

Choosing ability scores introduced a complication avoided when players just roll. Some stats prove more useful than others. Chivalry & Sorcery included an attribute for bardic voice. No one but bards would have invested there, and C&S lacked bard as a class. Also, the attributes that power your character’s key abilities bring much more value than the rest. The original D&D rules recognized that factor in the unequal exchanges that let players increase their character’s prime requisites.

In Advanced Dungeons & Dragons (1978), the recommended technique for generating ability scores allowed players to rearrange scores any way they liked. For most classes, Intelligence just brought extra languages and Wisdom only gave a saving throw bonus against magic “involving will force,” so these abilities became favored places to dump low scores.

In D&D, the value of ability scores mainly comes from the value the scores offer to classes that don’t require them. Constitution always comes out ahead because it adds hit points and improves a common saving throw. You may never see a fifth edition class based on Constitution because the attribute offers so much already. In earlier editions of D&D, Strength proved useful because every class sometimes made melee attacks. Nowadays, classes get at-will alternatives to melee attacks that use their prime requisite.

The value of ability score depends on what characters do in a campaign, and that adds challenge to balancing. In original D&D, shrewd players paid hirelings and henchmen to accompany their dungeon expeditions and share the danger. Characters needed Charisma to recruit and keep followers, so by some measures Charisma offered more benefits than any other attribute. But not every campaign played with hirelings. The 1977 D&D Basic Set skipped the rules for hiring and retaining help, so Charisma offered no value at all unless a DM happened to improvise a Charisma check—the game lacked formal rules for checks.

A similar factor makes Strength a common dump stat in fifth edition D&D. Strength provides the potentially valuable ability to carry more stuff, and more treasure, but few players even bother accounting for carrying capacity. The rules make dealing with encumbrance an optional variant. In the original D&D games, part of the challenge of looting the dungeon came from the logistical challenge of hauling out the loot. Runequest (1978) featured an encumbrance system that allowed characters to carry a number of “things” equal to their Strength before the weight hampered them. I remember the importance this system attached to Strength and the difficult choices of armor and equipment players faced. The secret to making Strength valuable is creating an encumbrance system that players use.When encumbrance feels like an accounting exercise that players ignore, Dexterity becomes king. By selecting ranged or finesse weapons, a Dexterity based character can approach the damage of a similar character based on Strength. Plus, a high Dexterity enables an AC nearly as stout as the heaviest armor, wins initiative, and improves common Dexterity saves rather than rare Strength saves.

Fifth edition D&D makes Intelligence another common choice for a dump stat. Of the classes in the Player’s Handbook, only wizard requires Intelligence, a prime requisite that rarely figures in saving throws. (See If a Mind Flayer Fed on D&D Characters’ Brains, It Would Go Hungry. Should PC Intelligence Matter?)

Third edition D&D boosted the value of Intelligence by awarding smart characters more skills. The fifth edition designers probably weighed the same approach, but with skills serving as key traits in the two pillars of interaction and exploration, perhaps the designers opted to award skills equally to characters of any Intelligence. So unlike in earlier editions, high Intelligence no longer brings D&D characters more skills or even languages.

Obvious dump stats limit the choices that lead to effective characters. Dump stats encourage players to create characters that fit common, optimal patterns. A fifth edition D&D party may include a wide range of classes and backgrounds, but almost everyone fits the mold of healthy, agile folks with low-average Intelligence. And not even the barbarian can open a pickle jar. (He’s dex based.)