Stormveil Castle is likely the first legacy dungeon you'll face in Elden Ring. It's the key to progressing further into the game and exploring more of the map, as it sits between Limgrave and Liurnia of The Lakes. A legacy dungeon is the most challenging dungeon in the area. It's one of the largest, and it harbors some of the strongest bosses.
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The boss in this area will allow you to kill your first demi-God and shardbearer, giving you access to a Great Rune. Lots of interesting loot and items can be found along the way, and you may want to bring a friend along for the ride. Killing Margit, The Fell Omen is necessary to access Stormveil Castle. Here is a thorough guide on how to beat him.
After beating Margit and walking up the stairs, the first thing you want to do is decide if you wish to go through the main gate or the side entrance. Entering the room on your left, an NPC will suggest you go along the cliffside to take everyone by surprise instead of opening the front gate. To open the front gate, you must tell this NPC you rather use the front entrance instead. If you have him open the gate, you can still go through the cliffside.
We recommend not going in via the main gate. It is the most difficult route. By entering through here, you're instantly met with multiple projectile bolts that will two-shot you and shoot from enemies up above with speed. While this is happening, there's an army of enemies up the road, at least three blockades. The items you see past the gate are Golden Runes and Bolts.
The NPC who tells you to go along the cliffside is Gatekeeper Gostoc, and he is a liar. Every time you die on this route, he will take a portion of your runes.
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