There are two ways to open the Stormveil Castle Main Gate in Elden Ring. This guide will show both the ways to open the theStormveil Castle Main Gate. Click here to see the complete walkthrough of Stormveil Castle.
Ask Gostoc to open the Gate
From the Stormveil Main Gate, enter the room on the left side as shown below. In this room, you will find Gatekeeper Gostoc. He will advise you against taking the main gate. But if you request him, he will open the main gate for you.
Open the Stormveil castle Main Gate Manually
I will show the path to reach the gate lever from Rampart Tower Site of Grace. Click here to see how to reach the Rampart Tower. From the Rampart Tower Site of Grace, exit the room through the door on the north side of the room to reach the terrace. Then turn right and jump on the roof on the east side. The roof is a bit far. So, you will need to jump from the edge of the tile as shown in the picture below. From the roof, jump down on the north side to reach the courtyard. From there, go east as shown below.
Path east from the courtyard will lead you to the main gate. On the right side of the main gate, you will find a room as shown in the picture below. In this room, there is a lever that opens the Stormveil castle main gate.