Swords & Wizardry
Complete Rulebook, RevisedCore Mechanic
Roll a d20 to hit, comparing the result to the target's Armor Class using either ascending bonuses or the original descending-AC math. A single saving throw number, adjusted by class, resolves every save against poison, magic, breath, and the rest.
Best For
Players who want a clean, flexible retroclone of original-style fantasy for old-school dungeon crawling and sandbox campaigns that grow into domain play.
Highlights
Every character uses a single saving throw number modified by class, replacing the five-category save table of the games it emulates. Combat supports both ascending and descending Armor Class with parallel to-hit rules, so groups can use modern or original-style math from one book. Name-level characters can clear and hold wilderness to found strongholds, with random-castle and freehold rules turning late play into domain management.
Considerations
Character death comes fast at low levels, where first-level hit points are often low enough for a single hit to be lethal. Spellcasters prepare a fixed list of spells in advance and expend each on casting, with no flexible at-will magic. Many situations are resolved by Referee ruling rather than codified procedure.