If you are low on Flasks you are able to Elden Ring Runes rest, but there is an extra jump to do. Retrace your steps to the rooftop , then jump over the towers and return to the roof, passing by the crumbling pillar. Climb up like you are returning to the rooftop at which you obtained the Claw Talisman. However, instead, drop down onto the platform below and then fall down to an open rooftop which will reveal two soldiers off in the distance. Infiltrate behind the weaker one and backstab them in order that you can take on the halberd knight on one. Similar to before, your plan is going to be to strafe to backstab and counterattack when you find an opening. Be aware that the majority of his attack patterns have two parts, so you shouldn't over-attack too quickly.
Go over the bridge made of wood for access to another rooftop where you'll be joined by two soldiers. You will also find the Nomadic warrior's Cookbook [10on a wooden platform. Take the ladder to the opposite end of the rooftop , where you'll meet two more soldiers,, follow them to another bridge to meet another halberd knight , as well with a sword knight hiding. Be aware of your approach or you'll quickly be overwhelmed by two of them (The one who was halberd dropped a Banished Knight Helm (Altered) which I am able to use, however I'm unable to confirm that it is a guaranteed drop at this time). Find the Festering Bloody Finger from the body in front of you before descending the ladder next to a lower platform.
Go forward on this path and at the corner you'll find Arrow x10 and another ladder you can go down. The final platform will find the Golden Rune  and cheap Elden Ring Runes an unlocked doorway that is what we'll be able to access later. To get back, teleport into this Spot of Grace and we are now able to fight the Scion.