"To thave them until the Mathter hath finithed hith work. Hith work will be wonderful! Tho many people, living onthe more!" V'elen, considering the words, offers a hypothesis; that this plane was likely dying, so this 'master' is build new bodies, for the souls held in the Jar, that can survive more easily, and that this engine is far too recent of a construction to have caused the magical cataclysm they can sense.