Take the ladder back down to the ground, and Elden Ring Runes then follow your steps until you reach the roof with the crumbling pillar on it. You'll find a gap between the roof and that where you faced the stormhawk. You can heal to full HP and then drop down to the lower courtyard where there is the Stonesword Key door and a Somber Smithing Stone. Use your Stonesword Key you recently got...