The palimpsest is a very powerful tool of magic. One of the best known examples of a palimpsest, dealing with transcendental physics, is a Scroll of Gating that takes the caster to the Ethereal Plane of Atrii. This palimpsest, although not as robust as a Dimension Door, is one of the very few known ways to contact the Implementors, and is extremely powerful indead. In 966 GUE, these scrolls were worth about zm20.

SOURCE(S): Beyond Zork