So I'm currently running Delzomen's Iceforge from Frostburn, and they just entered the library. The books there have been damaged from the ice and snow over the past 100 years. However, if the party can restore them, they'd either get a +4 bonus to various knowledges, or if they can fix them for 6000 gold, two months of work, and a Craft 25 (bookbinding). Mending and Make Whole do not work as these have just aged badly over time.
The wizard is not impressed with needing to spend that long fixing the books, nor is the rogue. The original idea was to grab empty books and copy them via spells, but the wizard is now looking to design his own spell that would specifically fix the books. Then he'll patent it, and sell it to archeologists who unearth ancient tomes.
Any idea how one would design this, of if there's already a spell that basically does this?
Also, for anyone who's ran this adventure, what did you do this situation?