Ars Magica: Houses of Hermes - True LineagesBonisagus Guernicus Tremere Mercere The True Lineages are the backbone of the Order of Hermes. In these four Hermetic Houses, each magus was taught by a magus of the House, and that master apprentice relationship goes back to the founders. This sourcebook details the four True Lineages, including rules for original research, unique forms of magic, and new Virtues and Flaws. House Bonisagus descends from the two magi who created the Order, and