Whitehack
Fourth EditionCore Mechanic
Roll d20 under your attribute to succeed; the face value of a success indicates quality. Positive double rolls (roll 2d20, pick best) and negative double rolls (pick worst) replace flat modifiers. Characters are defined by Groups (species, vocations, and affiliations) which grant advantage on relevant tasks. The Wise class casts miracles by spending HP, with effects triangulated by their groups and wordings.
Best For
Experienced players who want a concise, elegant OSR system that rewards creative play: where freeform character groups replace rigid skill lists and miracles are flexible but costly.
Highlights
Concise yet deep (~136 pages), Groups system replaces both skills and feats, compatible with old-school modules from 1974 onward, Auction mechanic adds tension to extended contests, miracles system rewards creative description, four editions of refinement
Considerations
Dense writing requires careful reading: not a quick-start game, assumes familiarity with old-school play, no bestiary or setting included, rare classes may feel underdeveloped