Kathy Ryan was on the Mage train since almost the beginning and she shares her experiences adding Amanda and Senex, shifting the Marauders and the Nephandi, and some of her notes for what her M20 metaplot would have been. The Show Our Patreon! Rich Bastard's Guide to Magick - Preorder for M20 high power book Books mentioned
Book of Worlds - Book where we get information about Amanda's Avatar and the twice-born.
Swords of Faith - The compilation of the Euthanatoi, Celestial Chorus, and Akashayana of which the first contains much of the Amanda plot