I don't trust Combat Manuals

What do you mean?

You can exchange Combat Manuals for feathers, so I mean......

Yes they are. When you are not watching, the manuals eat your feathers, and make nests in your castle, slowly but surely, and multiply. And one day, you will wake up featherless and surrounded by hostile manuals. Then the true nightmare will begin. Do not trust manuals. Your life is at stake