There are multiple floors here, connected in weird ways and places.
Fortunately, with this chapter you should have no problems locating the mentioned switches.
The recommended level for this dungeon is 50.
Crestholm Channels can be found in the eastern part of the map, to the east of Hammerhead.
The exact location can be seen on the above screenshot.
Name
Hints
Bussemand
Vulnerable to Greatswords, Machinery, Light and Fire, resistant to Lightning.
Gelatin
Vulnerable to Lightning and Light, resistant to all other types of weapons, absorbs Fire and Ice.
Yojimbo
Vulnerable to Polearms, Firearms, Lightning and Light, resistant to Fire.
Capable of causing Instant Death to several characters at once.
Nagarani
Vulnerable to Swords, Shields, Lightning and Light, resistant to Fire.
Ereshkigal
Vulnerable to Swords, Shields, Fire and Light, resistant to Lightning.
Jormungand
Vulnerable to Swords, Daggers and Ice, resistant to Fire.
The boss is vulnerable to Swords and Daggers and the damage can be further enhanced by Ignis' Enchant.
Use the stairs to get to the lower floor and use the ladder to get inside the dungeon.
You should now be standing nearthe first of the four switches.
Activate it, jump down, run a little forward, turn right and slide down the canal.
The first real encounter awaits you here.
You should reach a more spacious room now, with thesecond control panelinside of it.
Activate the mechanism, get back into the corridor and follow the path.
Run downstairs and jump down into a small hole in the wall.
Collect the item located on the other side and jump down into a narrow passage.
Continue to the east through the tunnel.
Climb two more pairs of stairs until you reach another spacious room.
Continue along the narrow passage and get to the other side of the room by using the makeshift bridge.
Go through four pairs of stairs and you should reach another room.
Climb up the ladder, go through another tunnel and climb another ladder located at the end of it.
At the top of the second ladder there will bethe third switch.
Activate it, go through the nearby passage and run along the tunnel.
Continue forward once you reach the crossroads.
Once railings appear on your right side, jump down and run into the second (middle) tunnel.
Continue along it until you reach the fourth and the last switch.
Activate it and get back to the tunnel you came from.
Turn right at the end of it and run into the next tunnel (turning right again).
Run upstairs, jump down and run up another pair of stairs.
Jump down, turn right and slide down the tunnel to finally a room with the boss.
Jormungand is a fast enemy, capable of dealing high damage.
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