Editing Advanced Dungeons & Dragons (section)

===Armor Class===
The scale went from 10 to -10 on armor class with 10 being the worst and -10 being best, this being a choice made to incorporate the d20 in an approximation of ''Chainmail'''s combat system. Armor class was essentially representative of a bonus to the attacker. Unarmored targets gave a 10 point bonus, Heavily armored targets gave less of a bonus, and super heavily armored (or extremely agile) targets could impose negatives to the attack roll.