Sewer Town – Center is the tenth area of the game. The main path of this area is relatively short, but includes the hidden path leading to the Courtyard of the Tree hidden area, which you are required to access for two of the endings. This also involves the completion of Millaire’s questline in the process.
Sewer Town – Center
Central Station
From the start of the area go in the first elevator and past the two Sewer Cleaner enemies. Before going into the next subway car look left (with the subway car door on the right) to find a vending machine.
Headwear: Twisted Braid – Purchasable from Opossum’s Vending Machine for 5000 Crystals.
Headwear: Long Hair – Purchasable from Opossum’s Vending Machine for 5000 Crystals.
Key Item: Soil: Subway Station – Continue along the main path until you drop into a hole with some poison-spitting human enemies around you, the soil is nearby. Return it to Delpha who should be at the Arboretum if you have been following the walkthrough and use Purified Soil at a Branch to increase Life Dew charges. If you have given him all prior Soil Samples then you will now earn 
Gardener after using this final one.
From the area where you drop down there area two paths, toward the Sewer Cleaners and Drones leads to the next story area, but through the subway car on the opposite side of the room leads to the hidden area which you should go to first.
Underground Shaft
This area is a large shaft where you need to carefully drop down platforms to progress. Watch your health while you are dropping as some drops are long enough to deal significant damage.
Item: Alcohol – From the Branch, drop down to the first platforms and then on the first beams jump across the gap in the middle. You can then drop down to the left to another set of beams which allow you to reach the doorway. In this room you can pick up the alcohol.
Lost Blader #6 – Take the elevator in that room up to reach a platform above the Branch, where you can find what looks like a Void enemy, but is the final Lost Blader. If you have defeated all prior ones you will now earn 
The End of the Lost Ones.
Weapon: Blader Longsword – Obtained after defeating the Lost Blader.
Key Item: Dew Essence – Return to the Branch, then start dropping down the tube sticking to the right side beams to reach the lower center platform. Defeat the Butterfly enemy to receive the Dew Essence.
Item: Sacred Blood Crystal – Keep dropping down to the lowest level, then through the tunnel. Once you enter the large room you can find this on the left (red circle) before the next Branch (green circle).
Gate of the Tree
Main Seal: Seal of the Tree – Interact with the Memory beside the Branch.
NPC: Millaire – After receiving the Seal, go back to the Temporary Campsite and speak with Millaire to show her the Seal. Then return to the Gate of the Tree and speak with her there to have her open the door, earning Brilliance of the Tree trophy/achievement. Millaire will then join you as you enter the area to fight the boss. Millaire questline #5/6
Boss: Guardians of the Tree
Trophy/achievement Guardians of the Tree
Nucleus: Guardian’s Nucleas – Obtained automatically after defeating Guardians of the Tree Boss.
Weapon: Wilted Foliage – Purchase from Assis for Guardian’s Nucleus + 8000 Crystals
After the boss fight walk off the ledge toward the tree.
Sewer Town – Courtyard of the Tree
Central Garden
After interacting with the Branch go up to the stairs and speak with the NPC Charon, respond to her however you like.
Normal Seal: Gush – In the mud behind Charon.
Headwear/Armor: Guardian Helmet/Guardian Armor – From the branch walk counterclockwise around the circular path. Just past 1/4 of the way around you can pick this up off an empty pillar.
Continue slightly farther where there are some stairs leading to a platform with a glowing spot. Interact with it to be transported to a hidden area in Sewer Town – Southwest.
Normal Seal: Collapse – Follow the tunnel left to the room with the Void enemies where you can pick this up off the ground.
Weapon: Blader Swords – Continue through the tubes until you drop into another room, this will be directly in front of you.
NPC: Millaire – Return to the Temporary Campsite and Millaire will be in a slightly different spot, where she will stay for the rest of the game. Millaire questline #7
You can now return to Sewer Town – Center > Central Station and return to the spot where you drop down. To continue to the next main area go down the hallway where two drones and Sewer Cleaners are patrolling.
Hidden Platform
Interact with the train to progress to the next area.
Next up: Outer-Wall Ruins – Ancient Machine Works
For all other areas refer to the AI Limit Walkthrough.
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