Bookbound is a small mod that changes how books are obtained. Bookbound changes the recipe of a book to require 2 paper, 1 leather, and 1 new item called an ancient manuscript. Ancient manuscripts are a rare drop from zombies, creepers, and husks. Additionally, zombies will rarely drop feathers, creepers will rarely drop tnt, and husks will drop paper and sand. Another change is the addition of rotten flesh bundles. These are crafted from 8 rotten flesh and 1 string, and can be smelted in a furnace or smoker to get leather. There is no config file currently, but this is planned.
Also check out my other mod chaos lands:
https://www.curseforge.com/minecraft/mc-mods/chaos-lands
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