From the Beside The Great Bridge site of grace in Farum Azula, take the elevator behind your spawn location, walk outside to a rocky outcropping with a group of trees, and look for a ledge below ...

The Godskin Duo is a mandatory boss encounter in Elden Ring and you will be able to find them in Crumbling Farum Azula.

Placidusax is located in Crumbling Farum Azula, which you'll eventually visit ... Once outside, get near the ledge of the small piece of land and go along it until you see a small platform to ...