User may both write messages in books and rewrite spell scrolls with a previously known spell. For new spell scrolls mana, time and an old scroll are needed. Backfire effects are possible. To write text in a book, use the skill as: use_skillwriting <msg>. This skills is only available as a 'writing pen'; the literacy skill must be possessed before this can be used.
Maybe I'm missing something, but isn't this skill actually called