Ars Magica
Game
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Ars Magica is a role-playing game set in 'Mythic Europe' – a historically grounded version of Europe and the Levant around AD 1200, with the added conceit that conceptions of the world prevalent in folklore and institutions of the High Middle Ages... Wikipedia
Designers: Jonathan Tweet and Mark Rein-Hagen
Publication: 1987 (1st edition); 1989 (2nd edition); 1992 (3rd edition); 1996 (4th edition); 2004 (5th edition)
Systems: d10-based with strong magic system