Talk:Skill Bookshelf 5 Tiers/@comment-39264708-20190426050425/@comment-3302832-20190426145046

I'm not able to have a look ingame, but the reason is probably that the cultural development (adventure, trade and battle contribution) isn't high enough. The town has to be in Central Capital status (all 3 aspects above 40k) to have access to this recipe.

Hope this helps.