I'm putting together a variant mystic profession for my campaign world, and in doing so I thought spells to change to solid (e.g., stone, wood, metal), liquid, or gaseous form would be fitting for them. I've combed the books and find nothing - which is surprising. Am I missing them somewhere, a Companion I don't have?
I'm also interested in thoughts on how any of these would work, especially "but how" scenarios.