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

Partitio Chapter 4 Walkthrough

Chapter Summary and Introduction

After receiving financial support from the noble Alrond, Partitio receives word that Roque is going to make an important announcement regarding the steam engine. So he sails to Roque Island to complete his deal with Roque.

Roque Island

	Objectives
1	Make for the Roque Company: Headquarters Head north to the next area to trigger a cutscene.
2	Find an Alternate Route to the Headquarters Head to the local tavern in the southwest side of the area.

The Roque Company: West Tower

	Objectives
1	Go to the Conference Follow the path until you reach the East Tower and then the Headquarters. In these areas you'll have several combat encounters and find several chests. At the end of the East Tower, you'll find a last save point. The boss fight will ensue in the next area so be sure to make a save here.

The Roque Company: Headquarters

	Objectives
1	Purchase the Rights to the Steam Engine Use Path Action Purchase on Roque to purchase the rights to the steam engine.
2	Defeat the Boss After purchasing the steam engine rights from Roque, the boss battle will ensue. There is a Save Point in the East Tower exit before reaching the Headquarters. Be sure to make a save before continuing. Defeat the Steam Tank Obsidian to continue forward. If it proves to be difficult, it is recommended to wander around the East Tower to grind more EXP. ▼ Jump to Boss Guide ▼
3	Hire Roque Use Path Action Hire on Roque to continue.

Partitio Chapter 4 Side Stories

All Chapter 4 Side Stories

List of All Side Stories and Side Quests

Partitio Chapter 4 Path Actions

Purchase

Character	Information
Roque	Required Funds: 8000000 Obtainable Item/s: ・Contract Roque Location: Found on stage.

Hire

Character	Information
Roque	Stats ・Strength: 6 ・Skill: None Required Funds: 1 Roque Location: Found on the northwest side of the area.

Partitio Chapter 4 Enemies Encountered

Roque Island

Enemy	SP & Vulnerabilities
Ocean Lizardking III	Shield Points: 5 SP Weaknesses:
Ocean Lizardking II	Shield Points: 4 SP Weaknesses:
Scythe Crab	Shield Points: 4 SP Weaknesses:
Reaper Crab	Shield Points: 4 SP Weaknesses:
Cetus Maximus	Shield Points: 6 SP Weaknesses:
Winged Landwalker	Shield Points: 4 SP Weaknesses:
Shipeater	Shield Points: 4 SP Weaknesses:
Ocean Lizardking I	Shield Points: 5 SP Weaknesses:

Partitio Chapter 4 Boss Guide

Steam Tank Obsidian Shield Points and Weaknesses

Enemy	SP & Vulnerabilities
Glacis Plate	Shield Points: 6 SP Weaknesses:
Smokestack	Shield Points: 5 SP Weaknesses:
Cannon	Shield Points: 4 SP Weaknesses:
Steam Tank Obsidian	Shield Points: 40 SP Weaknesses:

How to Beat The Steam Tank Obsidian

Focus on Destroying Front Parts Immediately

The Steam Tank Obsidian has three parts protecting its weaknesses and raising its shield. Try to focus on destroying The Cannon, Smokestack, and Glacis Plate as soon as possible to unlock the weaknesses and bring down the tank's shield value to a more manageable value. The different parts also have vicious attacks and can really do a lot of damage if they can all attack on the same turn.

Time Your Attacks and Breaks

The different parts of the Steam Tank take several turns before they launch another attack. Always make note of this to determine which parts you can currently focus on and ignore for the turn. Tracking this will also allow you to break them at the right time to extend their inactive turns.

Break and Boost System Guide

Utilize Attacks Targeting All Foes

Despite having inactive weaknesses, the Steam Tank can still take damage while the other parts are still present. Utilizing multi-target skills such as the Hunter's Draefeni's Bow, the Apothecary's Sweeping Cleave, or the Dancer's Dagger Dance will allow you to decrease the shield value of the other parts while still dealing damage to the Steam Tank.

List of All Skills

Launch Heavy Attacks When Weaknesses are in Effect

The Steam Tank can repair itself bringing back all the other parts to life. So once you are able to unlock its weaknesses, break the tank and launch all your best attacks to try to destroy it as soon as possible.

Partitio Chapter 4 Chests

Roque Island

All Chest Locations
Critical Bracelet Outside of Roque Island Headquarters, in front of the East Building.	Enlarge
Magic Nut (L) Left-most chest within the house blocked by a Guard in the northwest part of town.	Enlarge
Rejuvenating Jam Chest, second from the left, within the house blocked by a Guard in the northwest part of town.	Enlarge
Rejuvenating Jam Chest, third from the left, within the house blocked by a Guard in the northwest part of town.	Enlarge
Rejuvenating Jam Chest, third from the right, within the house blocked by a Guard in the northwest part of town.	Enlarge
39800 Leaves Chest, second from the right, within the house blocked by a Guard in the northwest part of town.	Enlarge
Empowering Lychee (L) Right-most chest, within the house blocked by a Guard in the northwest part of town.	Enlarge
Herb of Healing In front of the left staircase that leads out to Roque Island Anchorage	Enlarge

The Roque Company

All Chest Locations
Inspiriting Plum Basket At the bottom of the steps after parting ways with Ori.	Enlarge
Empowering Lychee (L) On the southwest corner of the upper rafters.	Enlarge
Fire Soulstone (L) To the left of the large brick furnace.	Enlarge
Venom Lance Across a short gap that you have to cross via canoe.	Enlarge
24500 Leaves On the third room from the right in the east tower.	Enlarge
Large Silver Ore In the right-most room in the east tower found near a couple of stacks of wooden crates.	Enlarge
Olive of Life (L) By the front east-end of the east tower.	Enlarge
Aged Wine Inside the west room with the barrels. You'll have to pass behind a brick wall to get to it.	Enlarge
Refreshing Jam Inside the room east of the front desk of the east tower.	Enlarge

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)