In the canyon's narrow entrance there is the Site of Grace from spring's blog

How to Get to Stormveil Castle.The Legacy Dungeon Stormveil Castle is easy to find, as you can see it on the cliffs from the moment you leave your tutorial dungeon in Elden Ring Runes the Stranded Graveyard and enter Limgrave. Getting to it is another thing to consider.

If you take the road to the east, you'll be able to access the huge Storm Gate, but be prepared for a host of Godrick Soldiers and Crossbowmen waiting behind barricades, as an massive Stonedigger Troll swoops down from the ruins above the small canyon to ambush you. It's not a pleasant experience, and you may want to bypass it either by racing through Torrent or traveling further East to find the Spiritspring Jump point to get to Storm Hill.

In the canyon's narrow entrance there is the Site of Grace located at the Scavenger's Shop, where your encounter will include Character Roderika. She'll provide a little of info about the castle, as well as The Spirit Jellyfish Ashes to hold to, and eventually go on into the Roundtable Hold.

Further on Elden Ring Items are more patrols of soldiers and soldiers that will eventually lead you to the main Stormveil Castle Gate, but the gate is heavily fortified with barricades that are lined with soldiers, and one guard at the tunnel's entry point. It's got incredible range and power, therefore you should speed up and Torrent into the thick forest to the left as begin your journey, and after which you can race ahead across the castle's walls to take out and destroy the ballista. Then, take away the remaining troopers in smaller groups.