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 Chapter 4 Walkthrough

Chapter Summary and Introduction

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.

Timberain

	Objectives
1	Look Around Town Head to the west side of town to trigger a cutscene.
2	Find a Way to Get the People to Safety Head to the local tavern east of the area.
3	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	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. ▼ Jump to Boss Guide ▼
2	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	Soothe Malaya Use Path Action Soothe on Malaya to complete Castti's story.

Castti Chapter 4 Side Stories

All Chapter 4 Side Stories

Castti Chapter 4 Path Actions

Soothe

Character	Information
Malaya	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
Trousseau	Shield Points: 8 SP Weaknesses:
Woodland Birdking III	Shield Points: 5 SP Weaknesses:
Shadow Raven	Shield Points: 3 SP Weaknesses:
Spiny Shrew	Shield Points: 3 SP Weaknesses:

Castti Chapter 4 Boss Guide

Shield Points and Weaknesses

Enemy	SP & Vulnerabilities
Trousseau	Shield Points: 8 SP Weaknesses: Weakness Change:

How to Beat Trousseau

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

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

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

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.	Enlarge
Wind Soulstone (L) To the left of the gate at Timberain Castle: Town Square	Enlarge
Rusty Polearm After defeating the Elderly Soldier in Timberain Castle's Town Proper, find this chest on the otherside of an underground hidden passage.	Enlarge

Timberain Castle

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

Timberain Castle: Roof

Heads Up!	This section is still under construction!

Octopath Traveler 2 (Octopath 2) Related Guides

Story Walkthrough: All Character Storylines

All Character Storylines & Routes

Ochette's Path
Chap. 1				Chap. 2												Chap. 3
				Cateracta				Tera				Glacis
Osvald's Path
Chap. 1				Chap. 2				Chap. 3				Chap. 4				Chap. 5
Hikari's Path
Chap. 1				Chap. 2				Chap. 3				Chap. 4				Chap. 5
Agnea's Path
Chap. 1				Chap. 2				Chap. 3				Chap. 4				Chap. 5
Partitio's Path
Chap. 1					Chap. 2					Chap. 3					Chap. 4
Castti's Path
Chap. 1					Chap. 2					Chap. 3					Chap. 4
					Winterbloom Sai
Throne's Path
Chap.1					Chap. 2					Chap. 3					Chap. 4
					Father Mother					Father Mother
Temenos' Path
Chap. 1					Chap.2					Chap. 3					Chap. 4
										Crackridge Stormhail

All Crossed Paths Routes

Crossed Paths Pairs
Dancer & Warrior	Scholar & Merchant	Cleric & Thief	Apothecary & Hunter

Final Chapter: Extra Stories

All Extra Stories and Unlock Condition
Introduction
Tranquil Grotto	Fellsun Ruins	Tombs of the Wardenbeasts	Flamechurch
Vidania (Epilogue)

All Scent of Commerce Routes

Scent of Commerce Guides
Tropu'hopu (Ship)	Sai (Manuscript)	Winterbloom (Gramophone)