Landmark/Switch
Descent into the underground � The ladder is in the location past the main hall, on the right.
The urns � They allow you to open the gate to the castle. Your task is to kill the opponents standing right next to the urns - the souls of the defeated creatures pave the way ahead.
The chamber with statues (the underground) � After you exit the location with the bonfire, go right. To open the door, you need to kill the two guards next to it. The left side, door [nothing], the door 2 [Pharros' Lockstone], door 3 [Darkdiver Grandahl]. The right side, door 1 [continue this stage], door 2 [Mastodon Greatsword], door 3 [Royal Soldier's Ring +1]
Statues � - In the location with the elevator, climb up the ladder on the right. Once there, you will have to kill the stone soldiers next to the urn, in order to open the passage ahead.
NPC (friendly)
Chancellor Wellager
Darkdiver Grandahl (the underground) � See: The chamber with the statues (underground). After you open the last door and enter the backstreet, the floor will collapse under your feet, which will reveal the Grandahl.
Queen Nashadra
Benhart of Jugo
Milfanito � See: The Embedded.
The Embedded � Requires the Key to the Embedded (Shrine of Amana - boss). Opening the door will allow you to talk to one of her sisters - Milfanito. From her, you will receive the Ring of the Dead.
Passage to another location
THRONE OF WANT � - Requires the King's Ring. To the left of the first bonfire (King's Gate).
KING'S PASSAGE � Requires the Key to King's Passage (in the chest in the location with The Embedded)
Trap
A TRAP (poison) � The masks on the wall shoot poison darts. It is best to long alongside the walls.
Bonfire
Bonfire (the underground) � King's Gate.. After you descend into the underground, go along, across the 2 blue doors
Bonfire (the underground) � Under Castle Drangleic. In the location next to the Darkdiver Grandahl.
Bonfire � Forgotten Chamber. On the left side of the building, there is a ladder. The bonfire is right next to it, past the illusory wall.
Item
Faraam Armor Set (the underground) � After you jump into the rift in the ground, along your way to the Darkdiver Grandahla. The set is on the corpse.
Great Magic Barrier (the underground) � The first door on the right, next to the corpse and the stairs.
Titanite slab (the underground � In the chest immersed in acid.
Hunter's Blackbow � Close to the Forgotten Chamber bonfire, you can find a ladder down. The item is in the chest.
Soul Greatsword � Soul Greatsword + Caitha's Chime + Old Knight Hammer. In the location behind the statues, inside the crates.
Firestorm � On the upper floor, in the chest.
Fire Great Arrow x10 � On the upper floor in the chest. Watch out for the trap!
Key to King's Passage � Key to King's Passage + Soul Vessel + Fire Seed + Strong Magic Shield
Soul Bolt � Soul Bolt + Spell Quartz Ring+2 + Bonfire Ascetic
Shortcut/Passage/Area
Shortcut � You can open it only from the side of the location with the statues, after you defeat several tough opponents.
Rare opponent/Boss
Invasion: Nameless Usurper � It appears behind you, at the location with three knights and the painting.
Boss - Twin Dragonriders
Boss - Looking Glass Knight
Stone Guardians � Four of the opponents that pretend to be statues. You can kill them from afar, using the bow (these are the statues with the heads). They drop a rare Llewelyn armor (the set does not include the helmet).
oss - Throne Guardian & Throne Watcher � Requires the King's Ring (Undead Crypt)
Boss - Nashandra � Requires the King's Ring (Undead Crypt), Giant's Kinship (Memory of Jeigh - boss).