Advanced Dungeons & Dragons
Système d20 old-school avec classes, niveaux et lancers de dés pour les caractéristiques.
TSR
Core Mechanics
A d20 roll-high system with complex charts (THAC0), strict class/race restrictions, and a focus on dungeon crawling.
Universe & Setting
Classic fantasy settings like Greyhawk and Dragonlance, defining the tropes of the genre.