After you have hidden the amulet, there schould be something new for sale called "mysterious vial" or something like that, 4 vials in total with 500$ each, one of them is used to spike the drink of the goth
do i have to do this stuff plus something with the fairy
or
do this stuff (amulet and vial) is a way and doing something with the fairy is another way?
you have to do this or you will not be able to talk with the fairy about helping you