S.O.R.D.: System of Role Development
A universal RPG using a skill-based system¸ with some skill restrictions from chosen Culture and Profession. Resolution is by rolling d20 under skill. Combat uses a d20 somewhat differently (to-hit depends on attribute¸ while damage is modified by skill). - A description from https://darkshire.net/jhkim/rpg/encyclopedia/ with kind permission of John H. Kim