As with the spell engrave, except that you can change the inscription, both in style and content, or even make the inscription vanish altogether.
This “editing” can be done only once — the revised message is permanent.
There is no limit on how long you can wait before changing the inscription, but you must establish a command word to trigger the editing when first casting the spell. You can be at any distance from the inscription when you speak the command word and will the change.
Book of Lost Spells – Copyright 2015, Frog God Games, LLC