Octopath Traveler 2 (Octopath 2)

Castti Chapter 4 Walkthrough

Octopath Traveler 2 - Castti Chapter 4 Banner

This a walkthrough guide to Chapter 4 of Castti's Storyline in Octopath Traveler 2 (Octopath 2). Read on to find a summary of this chapter, possible side stories, use of Castti's Path Actions, enemies encountered, tips and strategies to beat the boss Trousseau, chest locations, and more!

Castti Related Guides
Castti Profile Castti Storyline
Chap. 1 Chap. 2 Chap. 3 Chap. 4
Winterbloom
Sai

Castti Chapter 4 Walkthrough

Chapter Summary and Introduction

Octopath Traveler 2 - Castti Chapter 4 Summary

With Castti's memories returned to her, she is reminded of the horror of her former colleague Trousseau's purple rain. She heads to Timberain to stop his evil plot that could hurt a lot of people.

Objectives
1
Stop Trousseau and Save the Town
Find Trousseau to stop him from using the Purple Rain to spread disease. Then find a cure for the ailment caused by the Purple Rain.

Timberain

Objectives
1 Octopath Traveler 2 - Look Around Town
Look Around Town
Head to the west side of town to trigger a cutscene.
2 Octopath Traveler 2 - Follow Edmund
Find a Way to Get the People to Safety
Head to the local tavern east of the area.
3 Octopath Traveler 2 - Make for Timberain Castle
Make for Timberain Castle
Head north to the next area and continue going north to reach Timberain Castle. Reach the top of the castle.

Timberain Castle: Roof

Objectives
1 Octopath Traveler 2 - Defeat Trousseau
Defeat the Boss, Trousseau
At the top of the castle, you'll encounter the chapter's boss. There will be a Save Point just before the area where he confronts you, be sure to make a save before continuing. Defeat the Trousseau to continue. If it proves to be difficult, it is recommended to wander around the castle to grind more EXP.
2 Octopath Traveler 2 - Soothe Malaya
Create a Cure for the Purple Rain
Use the available ingredients to make a medicinal concoction that cure the ailments caused by the rain.

Healeaks

Objectives
1 Octopath Traveler 2 - Soothe Malaya
Soothe Malaya
Use Path Action Soothe on Malaya to complete Castti's story.

Castti Chapter 4 Side Stories

All Chapter 4 Side Stories

Name Information
Proof of Innocence Location: Timberain
Client: Meylan
How to Complete: Bring Sickly Woman by the bridge of Timberain and return to client.
Rewards: 11000 Leaves, Nourishing Nut (L), Olive of Life (M)
A Forced Hand Location: Timberain
Client: Tiffany
How to Complete: Bring Margello, who is located in Montwise Library to the client or vice versa. Both instances will complete the Side Story, but will have different dialogue.
Rewards: 15000 Leaves, Mental Belt
Proof of Justice Location: Timberain
Client: Spectator
How to Complete: Pick up the hidden item in South Timberrain Trail. Then head to New Delsta: Backstreets and glean information from the Dour Elderly Woman on the street heading to the Game Parlor. Return to the client.
Rewards: 30000 Leaves, Fortifying Nut (L), Magic Nut (L)
Proof of Guilt Location: Timberain
Client: Meylan
How to Complete: Glean information from the Remorseful Old Man in front of the tavern. Pick up the revealed hidden item and bring it to the client at night.
Rewards: 12000 Leaves, Critical Nut (L)

Castti Chapter 4 Path Actions

Soothe

Character Information
MalayaMalaya Required Items
Skybalm
Benefit:
・Required to further progress the story.

Malaya Location: Found in the building the cutscene starts at.

Castti Chapter 4 Enemies Encountered

Timberain Castle

Enemy SP & Vulnerabilities
Octopath Traveler II - TrousseauIconTrousseau
Shield Points: 8 SP
Weaknesses:
Polearm Axe Ice Dark
Octopath Traveler II - Woodland Birdking IIIIconWoodland Birdking III
Shield Points: 5 SP
Weaknesses:
Axe Bow Wind
Octopath Traveler II - Shadow RavenIconShadow Raven
Shield Points: 3 SP
Weaknesses:
Sword Bow Wind Ice
Octopath Traveler II - Spiny ShrewIconSpiny Shrew
Shield Points: 3 SP
Weaknesses:
Sword Axe Wind Fire

Castti Chapter 4 Boss Guide

Shield Points and Weaknesses

Enemy SP & Vulnerabilities
Octopath Traveler II - TrousseauIconTrousseau
Shield Points: 8 SP
Weaknesses:
Polearm Axe Ice Dark

Weakness Change:
Sword Polearm Axe Ice Dark Unknown4

How to Beat Trousseau

Defeat as Fast as Possible

Octopath Traveler 2 - Defeat as Fast as Possible

The gimmick for this chapter's boss is the rain slowly decreases your party's maximum HP. There's no way to prevent this and sort of acts like a timer for the battle. The longer the battle lasts, the lower your party's HP becomes, the harder it is to survive Trousseau's vicious attacks. Make sure to bring your heavy hitting characters that can deal the most damage in the shortest amount of turns to quickly finish the battle.

Utilize Skills that Protect from Ailments

Octopath Traveler 2 - Utilize Skills that Protect from Ailments

Trousseau has a lot of skills that apply multiple ailments to multiple characters. Utilize skills such as the Apothecary's Rehabilitate or Cleansing Leaf Medical Concoction to protect your best characters during the fight.

List of All Skills

Break When Preparing After Transformation

Octopath Traveler 2 - Trousseau Transformation

At the midpoint of the battle, Trousseau transforms and becomes a lot more powerful. His shield is much higher and his prepared attacks can end the fight in an instant. However, he'll have a lot more weaknesses. Make sure you are able to break him in any way possible when he's preparing an attack indicated by the purple glow on his avatar.

Break and Boost System Guide

Bring Items that Restore SP and BP

Octopath Traveler 2 - Bring Items that Restore SP and BP

Trousseau has a skill that can deplete your party's BP and SP. This can be devastating when done at crucial moments of the fight. Items such as the Inspiriting Plum Basket or the Revitalizing Jam can be lifesavers for these instances.

List of All Items, Materials, and Valuables

Castti Chapter 4 Chests

Timberain

All Chest Locations
Protective Necklace
Go down the ladder east of the courthouse. Cross the short gap in the water via canoe and find this chest on the other side.
Wind Soulstone (L)
To the left of the gate at Timberain Castle: Town Square
Rusty Polearm
After defeating the Elderly Soldier in Timberain Castle's Town Proper, find this chest on the otherside of an underground hidden passage.

Timberain Castle

All Chest Locations
Diffusing Serum
Upon entering the castle, take the eastern staircase and go up the 2nd floor.
Herb Elixir
Found on the western wing of the 2nd floor.
Cleaver of Destruction
Found on the northern balcony of the 3rd floor.
Dreamy Flower
Found on a balcony at the eastern wing, near the entrance to the castle's roof.
23000 Leaves
Northeastern area of the castle's rooftop area.
Dragon's Helm
Middle section of the castle's rooftop area.
Energizing Pomegranate (L)
Along the veranda in the southwest area of the rooftop.
Mage's Robe
In a shallow walkway directly south of the rooftop's middle section.
Strengthening Serum
On top of a platform northwest of the rooftop area.

Timberain Castle: Roof

Hidden Item Icon.png Heads Up! This section is still under construction!

Octopath Traveler 2 (Octopath 2) Related Guides

Octopath Traveler 2 - Story Walkthrough

Story Walkthrough: All Character Storylines

All Character Storylines & Routes

Chap. 1 Chap. 2 Chap. 3
Cateracta Tera Glacis
Chap. 1 Chap. 2 Chap. 3 Chap. 4 Chap. 5
Chap. 1 Chap. 2 Chap. 3 Chap. 4 Chap. 5
Chap. 1 Chap. 2 Chap. 3 Chap. 4 Chap. 5
Chap. 1 Chap. 2 Chap. 3 Chap. 4
Chap. 1 Chap. 2 Chap. 3 Chap. 4
Winterbloom
Sai
Chap.1 Chap. 2 Chap. 3 Chap. 4
Father
Mother
Father
Mother
Chap. 1 Chap.2 Chap. 3 Chap. 4
Crackridge
Stormhail

All Crossed Paths Routes

Crossed Paths Pairs
Octopath Traveler 2 - Agnea SpriteOctopath Traveler 2 - Hikari Sprite
Dancer & Warrior
Octopath Traveler 2 - Osvald SpriteOctopath Traveler 2 - Partitio Sprite
Scholar & Merchant
Octopath Traveler 2 - Temenos SpriteOctopath Traveler 2 - Throne Sprite
Cleric &
Thief
Octopath Traveler 2 - Castti SpriteOctopath Traveler 2 - Ochette Sprite
Apothecary & Hunter

Final Chapter: Extra Stories

Octopath Traveler 2 - Ochette Sprite All Extra Stories and Unlock Condition
Introduction
Tranquil Grotto Fellsun Ruins Tombs of the Wardenbeasts Flamechurch
Vidania (Epilogue)

All Scent of Commerce Routes

Octopath Traveler 2 - Partitio SpriteScent of Commerce Guides
Tropu'hopu
(Ship)
Sai
(Manuscript)
Winterbloom
(Gramophone)

Author

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