Where floor can I get the book of curses?. And what meaning of the dungeon?, the door chicken?

I'll wait until someone answers my question, because this mission can't get out of the kingdom if it's not finished the mission 😭

To get the book talk with the knight and the lady, then check every bookshelf in the library.

The door about the chicken only open if you have kicked the chicken 5.000 times to get a costume for it.