Illusory Walls in Dark Souls 3 are hidden walls within the game. They will need to be hit with an attack, or rolled into to be revealed. This needs to be done by the host of the world, spirits both friend and foe have no effect on illusory walls.
Illusory Walls List
|Firelink Shrine||From the bonfire, head to the right side of the building via the upper stairwell and enter the castle turret with the spiral staircase. If you have not yet unlocked this gate, the key is sold by the Shrine Handmaiden. From the bridge, drop onto the roof of the Shrine and drop to the lower level of the roof. Follow around to the front and you will find a stairwell leading back into the building. Walk along the beams and exhaust the dialogue from an unseen NPC and continue to the back of the room. Strike the wall and jump down into the newly revealed room to find a chest containing the Covetous Silver Serpent Ring.|
|Old Wolf of Farron||
From the bonfire, leave back toward the swamp and turn left. Ascend the stairs and attack the wall on the left side, which appears to be a filled in arch, adjacent to Crystal Lizard spawn. Behind it is the Dreamchaser's Ashes.
|Catacombs of Carthus||From the bonfire head down the same path as the boulder, then take a left in the room with the rats. Between the candle-lit staircase and the exit at the end of the room is an illusory wall with another staircase that also leads to the same area as the staircase next to it.|
|Abyss Watchers (farron keep bonfire)||From the Abyss Watchers bonfire head into the Catacombs, pass the bridge into the next room, go upstairs where the archer is and find a ladder up here that goes all the way down a long drop. Follow this area until you come into a room with a red eye skeleton/assasin type enemy. There is a filled archway/illusory wall in this room, it leads to pyromancy tome. If you are having trouble locating the wall in this room, look for a broken wall that shows a skeleton archer standing on top of a platform, start hitting the left side (your right) of this wall.|
|Old King's Antechamber||In the same room with the Bonfire. It is the only wall not covered in roots. Unveiling the illusion will give you access to a rather long tunnel system which leads to the above area of the room where some big pyromancer demons and an Undead Bone Shard are below. This is an alternative way that gets you to the Estus Shard around here.|
|Old King's Antechamber||From the Bonfire, descend the stairs ahead, follow straight into a room with some dead demons and enemies. Continue further and in the next tunnel, and as soon as you hit a wall in front of you, unveil an illusion to the left. It provides area-exclusive access to a Black Knight with an axe equipped.|
|Old King's Antechamber||From the bottom area where some big pyromancer demons are, the is a tunnel system that eventually leads you to a small hole in the ground. Ignore that direction and go right instead. Rats are coming your way, and you will enter a room which one is somewhat grassy. Keep walking straight towards the wall, and unveil its illusion. This provides you access to the opposite side of a huge gap, and to Quelana Pyromancy Tome, in front of a since long dead giant spider. Plus an exclusive access to a lava pit of this area, which yields two Weapons, including a White Hair Talisman.|
|Old King's Antechamber||
From the bonfire, head down stairs and into the hallway with the pyromancers. Head down the tunnel on the lower right with rats, and proceed until you find the giant rat guarding a nest of smaller rats. Strike the wall on the left to unveil the illusion, and access a safe wooden Treasure Chest that yields Large Titanite Shard (3x).
|Old King's Antechamber||Behind the wooden Treasure Chest there at, that yields Large Titanite Shard (3x), is another illusion to be unveiled as well - cameo! Behind it, you can fall down to reach Izalith Staff, and an alternative way to access the lair of many cursing basilisks who dwell there at.|
|Church of Yorshka||From the bonfire, head back the way you came to it, down the stairs and around to the right. Either kill the Pontiff Knight patrol or wait for them to walk along. Follow the path down and up the stair ahead to a platform with a crystal lizard. The railing on the furthest right is an illusion, leading down some stairs and back toward the Central Irithyll fire. Drop down on the left and there will be an Evangelist that drops the spell Dorhy's Gnawing. Opening the nearby gate leads to just before the first set of Pontiff Knights in the zone.|
|Church of Yorshka||From the bonfire, head back the way you came to it, down the stairs to the main street and take a left turn. Follow the street until it ends, and to the right of the Lightning Gem treasure is a huge stone wall. Hit it to find the Magic Clutch Ring on a corpse behind it.|
|Church of Yorshka||From the bonfire, head out through the side exit, then take a left through the tunnel and the dark room beyond, until you arrive at an area next to the lake. Under the stairs you just descended are several arched alcoves. The rightmost alcove has an illusory wall at the back, which hides a small area with a Crystal Lizard who drops a Twinkling Titanite.|
|Pontiff Sulyvahn||From the bonfire, proceed straight through the door, left up the stairs and right through the valley of dead giants and into door at far end. Immediately on left is wall that can be struck to reveal a ladder. Descend the ladder, defeat the enemies to reach Archdeacon McDonnell and join the Aldritch Faithful.|
When the spiral staircase is low, descend it and enter the original whereabouts of the Blade of the Darkmoon Covenant. Inside, unveil the illusory wall behind the Gwyn statue on the opposite side. Provides exclusive access to the expected hallway, which yields a valuable item at its end.
|Lothric Castle||From the bonfire, go straight through the door leading to the Dragon Barracks bonfire, head left, right, then up the stairs. To your right there should be a door that leads to the base of a tower. There will be a Twin Axe wielding Winged Knight in there ready to drop down on you. After beating him, climb on up the ladder and on the wall near the entrance, to the left of the barrels, there's an illusionary wall.|
|Oceiros||From the bonfire, continue forward until you reach the room with the two chests. It is behind the second chest. This leads to the Untended Graves|
|Champion Gundyr||Inside the unlit Firelink Shrine, there are two illusiory walls that lead to where Irina of Carim is suposed to be (one when you go from Cornyx's location, one from the bonfire's location). Here you can get the Eyes of a Firekeeper.|
|Grand Archives||One level above the central walkway (where the Crystal Sage relocates to), in the area with two wax priests, several thralls, and a corpse in a corner holding a Titanite Scale. To the right of this corpse is the illusory wall (indicated by metal gates on either side), which hides a Frost Knight (drops Outrider Knight Armor Set) as well as Soul Stream.|
|Snowy Mountain Pass||Inside the bottom of the crypt filled with Giant Flies, past the only archway leading out of the room. This tunnel out leads to an illusory wall disguised as a dead end, which will let you open up the shortcut between the crypt and the Ariandel Chapel bonfire.|
|Snowy Mountain Pass||From the crank handle in the crypt, go towards the wall left of it. One of the archways on this wall is illusory and leads to two crystal lizards, the Pyromancer's Parting Flame, and an NPC Invader.|
|The Dreg Heap||Take a right after exiting the first building with Lothric Knights. Go through the building filled with Murkmen and upon hitting the end, hit the wall to your left. It will open up a staircase that leads you to Great Soul Dregs and the Covetous Silver Serpent Ring +3.|
|Shared Grave||Cross the bridge where you first fought Midir and enter the building. Hitting the wall next to the stairs (as well as the next two walls within this hidden tunnel) nets you a Hollow Cleric encounter, souls, and the Lightning Arrow miracle.|
|Ringed Inner Wall||Go down the elevator and about halfway down, jump out through the doorway. Turn left into the room filled with statues, and hit the statue wielding no weapons. This grants access to a ladder leading to the Antiquated Plain Set, and the Darkeater Midir boss fight.|