There are some hints here and there, specially Belinda tells you that with fletching materials they'll can make arrows.Another solid update and I really like the direction where this game is going.
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Initially you get one part of the materials from Leffrin at the start of the game, posteriorly, the other part of the resources can be obtained in Kaelkirk.
And there are various traders that accept arrows because in the future you'll be able to make more, same as other resources that you will be able to adquire more. For now I don't put all those mechanics in line, because I need to take care of the balance. In future updates I'll be more clear that balance so more options with the traders and nobles will be available to get more fletching materials, same as other materials.
And Thank you