Dungeons & Dragons Rules Cyclopedia
Rules CyclopediaCore Mechanic
Characters make attacks by rolling 1d20, adding applicable modifiers, and meeting the target number for Armor Class. THAC0 offers an equivalent subtraction method. Saving throws are d20 class-and-level targets, and spellcasters memorize limited spells that are expended when cast.
Best For
Groups who want a single reference for a long-running classic fantasy campaign that can move from dungeons to dominions. It suits readers comfortable learning optional detail alongside the baseline rules.
Highlights
Chapter 1 walks a player from ability scores through class, equipment, attacks, and saving throws. Separate combat procedures support personal fights, large battles, and sieges. Stronghold and dominion rules turn accumulated resources into rulership procedures.
Considerations
Character advancement reaches 36 levels before optional high-level paths add further decisions. Rules depth spans personal advancement, large battles, and domain administration, requiring a group to choose which procedures will matter. The game retains class-and-race restrictions and descending Armor Class rather than a universal skill resolution procedure.