Crestholm Channels dungeon locationFrom Hammerhead Outpost, start going back to the city of Insomnia. Head back to the place where you started the game, where you will find the Crown City Parking Spot. Watch out, because now this area is populated by enemies. On the right side you will see a fence and an open door. Go through it, and follow the path until you reach a sewer entrance. This is the entrance to Crestholm Channels dungeon. Climb down the ladder and you will find yourself in the sewers.
Crestholm Channels WalkthroughWhen you enter the sewers, start going to the left. You will see the stairs. Head up the stairs, and on the wall you will see the first generator out of four. Press the switch and this will turn on one of the four switches needed to unlock the door for Crestholm Channels boss. You can also pick up an Elixir in the nearby area.Go back, and kill the two level 44 Bussemands that are below the stairs. If you continue forward, you can proceed through the small passage to find Red Choker that increases your HP recovery rate. On the right you can slide down the pipe and you will drop into the room full of level 35 Gelatin and the Busemands (that you encountered before). Watch out, because at one moment a level 46 ronin Yojimbo will spawn. When you clear the room, head straight, and turn left. On the left you can go further to the upper level. Drop down to the room and you will find the second generator in Crestholm Channels.
Nagarani boss fightWhen you power up two generators, go back to the first room on that lower level. From there, go left, and make another slide to the room before the boss. Deal with the monsters there and continue onward. You will see the opening, and Ignis will make a comment that this is the only way down.Nagarani boss is a level 49 snake-like creature. This boss can be tricky, because the arena is very small and you must constantly dodge its attacks. One of the most characteristic things about this boss is that it has the power to transform Noctis and his friends into toads. The best thing you can do to avoid that is to wear a Moon Pendant that protects the whole party from the toad effect. It appears that the aerial attacks worked best when attacking this boss. Also, it is worth noting that there is a safe spot where you can go out of the arena for a short breather. You can also find all 3 magic sources there.
Crestholm Channels Walkthrough continuedFrom the arena, go up the stairs and climb the ladders that will lead you into the area above the boss fight. Cross the narrow ledge and proceed across the sewer pipe. You will find yourself in the room that leads to the Jormungand boss, the final boss of this dungeon. It will be full of level 39 Ereshkigal mobs, so clear the room first. At this moment you can not proceed to Jormungand, but search the area for the Blood Sword. It absorbs the health of the fallen enemies.
Climb up the ladders, continue to the next room where the Black Flan will wait you in the form of mini-boss. After you defeat him, go to the ladders and you will see that you are once again above the Nagarani boss room. Climb up the ladders and you will see the third generator in Crestholm Channels.Open the door and you will find the crossroads. If you go left, you will find the locked door that would lead you to the beginning of the dungeon. Along the way you will take the Wyvern Lance and the right road will take you to a locked door. Go straight from the crossroads, jump over the fence and go into the middle passage. Go down the stairs and you will find the fourth generator in the Crestholm Channels and obtain the headlights for Regalia.Go back to the room after the Nagarani boss fight, across the ledge and sewer pipe. The door to the final boss Jormungand will be open.
Jormungand boss fightJormungand is a giant snake-like boss with the head of a dragon. The arena where you will fight him is much bigger than the Nagarani fight, so make sure to take advantage of that. As you will have much more room to maneuver, don’t stand too close to him. The boss itself is very dangerous, it deals fire damage, so make sure to have some fire resistant gear equipped. He also has AoE attacks, so learn his moves in the process and know when to dodge them and when to attack him.
There is a Thermal Suit Outfit you can acquire later on in the game. If you somehow skipped this boss, be sure to pick up and equip this outfit before you come back for Jormungand. We’ve made a guide about it: Thermal Suit Location. This Suit protects you from fire.When you defeat him, that will be the end of the Crestholm Channels dungeon.