I love this! A great twist on some of the basic Nobilis ideas, but with a flavour all its own and drawing on some really interesting inspirations. “Egregore” is a brilliant word, and new to me! I love the feel of them, like ents of the psychic landscape.
The incorporation of broad but very clear outlines of the three skills adds so much clarity while still leaving it open for interpretation in various systems - a very smart bit of design. Might have to add something like that to mine!
Love the postscript on the last page, too.