Chapter 17: Bionis' Interior and Prison Island (Revisited) Walkthrough | Xenoblade Chronicles Definitive Edition

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This is a walkthrough for the Bionis' Interior and Prison Island (Revisited) section of Xenoblade Chronicles Definitive Edition for Nintendo Switch. For a map of Bionis' Interior and Prison Island (Revisited) Landmarks and Locations, as well as boss strategy and other tips and tricks, read on!

Chapter 17: Bionis' Interior and Prison Island (Revisited) Walkthrough

Colony 6

Objectives
1 Head to Colony 6's entrance.
2 Return to Junks.
3 Defeat the Telethias.
4 Defeat Sureny Telethia
Beware of Soul Read and focus on removing it with Purge or Soul Blast.
5 Defeat Sani Telethia.
Note 1 Now is the best time to explore the Bionis and do all side quests available. Explore and strengthen your characters before heading inside the Bionis.
Vanea will give you a quest regarding 5 Monado Replicas. To complete the majority of these quests. You need to have a level around the high 80's to low 90's which might make the game too easy.
Note 2 There will be a spike in difficulty upon reaching the bionis' interior. It is suggested to have your levels reach at least 70 to be able to proceed through the level.
But if you plan to do sidequests without making the final battle too easy, a recommended level you should attempt to reach is low 80's.
6 Talk to Miqol and ask him to take you inside the Bionis.

Bionis' Interior

Objectives
1 Make your way through the vein crossroad.
You will be encountering several Telethia elites on your way to your destination. Their levels are around the mid 70's, so make sure your levels are close to theirs before proceeding (unless you intend to avoid most of them).
2 Defeat the 1st Disciple.
3 Use the teleporter to leave the Bionis' Interior.

Prison Island

Objectives
1 Head through the Central Hall until you see a platform. Stand on it to reach the next area.
note This area is home to enemies whose levels range from 72-76. Level your characters to the high 70's or low 80's before proceeding.
3 Proceed to the teleporter stationed on the right side of the room.
4 Follow the narrow path until you reach the an open area.
5 Defeat the Obelis Obart and Demon Pavlosk.
The Obelis Obart and Demon Pavlosk have a rank 6 and rank 5 talent art. Level your shield art to 6 and use it against them if the fight is proving itself to be difficult.
6 Enter the area where the Demon Pavlosk came from to reveal your next destination.
7 Defeat both Sanjibal Behemoth's to proceed.
The Behemoth inhabits the same area, but the area itself is quite spacy. The Behemoths can be fought one by one to make the fight easier.
8 Climb the debris, then head to the right side of the room. Use the elevator to lift the elevator that's blocking the path below.
9 Descend to the Kitchen by using the walls of the elevator's path.
10 Open the gate and examine the Bone Pillar Control.
11 Return to the Arena.
Jump to the water to avoid a possible death.
12 Defeat Master Obart.
13 Follow the quest guide, then use the teleporter.
14 Cross the Gravina Bridge then climb the stairs until you reach the next teleporter
There will be several nebula enemies scattered along the path. You can draft a heavy ether team to dispatch them or make a pure physical team so you won't take their aggro.
15 After reaching the Gondorl Cathedral, head forward for a short scene, then head south and climb the tower. Activate the Dragon Summon.
16 Use the switch on the left most side of the teleporter to reveal the transporter.
This is the point of no return! Avoid going forward if you still wish to do some other activities, or make a duplicate save file so you can backtrack later.
17 Defeat the 2nd disciple.

Side Quests

From this chapter, a ton of new side quests will become available. Click on any of the buttons below to see the side quests in that area.

Colony 9 Side Quests

Click to View List
Quest Location Giver Rewards
Birthday Shoes Fortress Entrance Kantz +150 Reputation
42500 G
50000 EXP
Rex Helm
A Young Captain's Revival Fortress Entrance Miller +500 Reputation
25000 G
75000 EXP
Daze Plus V, Shulk's Skill Tree - Bravery
A Young Captain's Trust Fortress Entrance Miller +500 Reputation
25000 G
75000 EXP
Topple Plus V, Shulk's Skill Tree - Bravery
Friendship Tokens Tranquil Square Moritz +250 Reputation
330 G
65000 EXP
AP Up V, Friendship Tokens, Reyn's Skill Tree - Camaraderie
The Elite Captain's Anguish Fortress Entrance Raoul +250 Reputation
22000 G
35000 EXP
Topple Up V, Daze Up V
Getting to Know Minnie Tranquil Square Minnie 23500 G
23500 EXP
Muscle Up V, Strength Up VI
Getting to Know Dorothy Ether Light Dorothy 20000 G
20000 EXP
Ether Def Up V, Ether Up VI
A Token of Friendship Weapon Dev. Lab
-
- 72000 EXP
Vangarre Driver

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Tephra Cave Side Quests

Click to View List
Quest Location Giver Rewards
The Book of Bafalgar Bafalgar Tomb Shura +100 Reputation
The Blood of Bafalgar Bafalgar Tomb Shura +100 Reputation
The Path of Bafalgar Bafalgar Tomb Shura +100 Reputation
The Coffin of Bafalgar Bafalgar Tomb Shura +150 Reputation
The Gratitude of Bafalgar Bafalgar Tomb Shura +300 Reputation
35000 G
80000 EXP
Aura Heal IV, Auto-Heal Up III, Truth of the Giants

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Bionis' Leg Side Quests

Click to View List
Quest Location Giver Rewards
A Flower for a Rose Refugee Camp Dulland +150 Reputation
38000 G
92500 EXP
Cosmo Drones, Initial Tension VI
Battling Brutes Refugee Camp Dulland +200 Reputation
63500 G
158000 EXP
Eternity Knives, Speed V Frame, Speed V Booster, Fiora Skill Tree - Innocence
Supplies for Satorl Refugee Camp Elior +100 Reputation
45000 G
58000 EXP
Speed V Goggles, Speed V Arms

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Colony 6 Side Quests

Click to View List
Quest Location Giver Rewards
Family Secrets North of the pond Zel Argentis +100 Reputation
20000 G
23000 EXP
Rondine Cap, Rondine Gloves
Betrothal Test North of the pond Oleksiy +100 Reputation
23500 G
26000 EXP
Rafaga Gauntlets, Rafaga Boots
Stopping the Elopement North of the pond Don Argentis +500 Reputation
28000 G
30000 EXP
Satellite Shot, Hierax Top, Sharla Skill Tree - Affection
Lifespan of a Machine Reconstruction HQ Neonik +150 Reputation
38000 G
31500 EXP
Revival HP Up V
A Poet's Concerns Near the farm in town Yura +150 Reputation
38500 G
33000 EXP
Unbeatable IV
Delivering the Undeliverable Stand south of entrance Shilx +100 Reputation
23000 G
29500 EXP
Spike V
Finding the Unfindable Stand south of entrance Shilx +200 Reputation
31500 G
37500 EXP
Forma Spear
Nopon Determination Reconstruction HQ Mefimefi +150 Reputation
48000 G
72000 EXP
Arts Heal VI
A Dauntless Trader Reconstruction HQ Werner +150 Reputation
33000 G
37500 EXP
Auto-Heal Up V, Fall Defence IV, Terrain Defence IV
Securing Provisions Reconstruction HQ Dulland +150 Reputation
36000 G
42500 EXP
Replica Monado 1 Junks Ship Vanea 12000 EXP
Monado Rudra
Replica Monado 2 Junks Ship Vanea 12000 EXP
Monado Agni
Replica Monado 3 Junks Ship Vanea 12000 EXP
Monado Abyss
Replica Monado 4 Junks Ship Vanea 12000 EXP
Monado Dogma
Replica Monado 5 Junks Ship Vanea 12000 EXP
Monado Saga
Melancholy Tyrea Watchpoint Junction Surprise Quest 58500 EXP
Empress Staff, Auto-Atk Stealth VI
Defend Colony 6 - Ancient Reconstruction HQ Colony 6 Residents +100 Reputation
15000 G
10000 EXP
Defend Colony 6 - Demon Reconstruction HQ Colony 6 Residents +100 Reputation
20000 G
30000 EXP

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Satorl Marsh Side Quests

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Quest Location Giver Rewards
Challenge Sororal Statues High Entia Refugee +50 Reputation
58000 G
52000 EXP
For a Friend Sororal Statues Rozeal +300 Reputation
20000 G
25000 EXP
A Merciful End Sororal Statues Rozeal +500 Reputation
38000 G
40000 EXP
Debuff Plus VI
A Release from Duty Sororal Statues Rozeal +700 Reputation
72000 G
85000 EXP
Aggro Down V
The Imperial Ceremony Sororal Statues Scarlen 66000 G
90000 EXP
High Entia Emblem
Imperial Ceremony Offerings Sororal Statues Scarlen -

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Makna Forest Side Quests

Click to View List
Quest Location Giver Rewards
Final Challenge of the Sage Divine Sanctuary Nopon Sage +250 Reputation
38000 G
73500 EXP
Meteor Nibbler, Riki Skill Tree - Heroism

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Frontier Village Side Quests

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Quest Location Giver Rewards
Restoring the Capital Nopon Tower Nelo +200 Reputation
13000 G
22000 EXP
Power V Goggles, HP Up V
Restoring the Capital 2 Nopon Tower Nelo +250 Reputation
16800 G
28000 EXP
Power V Arms, Agility Up VI
Broken Ether Furnace Nopon Tower Kaleka +300 Reputation
20000 G
43500 EXP
Power V Boosters, Strength Up VI
Broken Ether Furnace 2 Nopon Tower Kaleka +500 Reputation
42000 G
72000 EXP
Power V Frame, Sedna Drones, Ether Up VI
A Memento of Daddy Reservoir Atael +300 Reputation
38000 G
40000 EXP
Will-o'-Wisp Staff, Physical Protect VI
Bana the Betrayer Pollen Works Gadada +500 Reputation
100000 G
200000 EXP
Haste VI, Double Attack V, EXP Up VI
Presents for Priceless Pupils Pollen Orb Storehouse Dobadoba +150 Reputation
30000 G
35000 EXP
Aggro Up V
Safer Energy Pollen Works Gadada +100 Reputation
30000 G
50000 EXP
Slow IV
Distilling Active Ingredients Pollen Orb Storehouse Cherri +100 Reputation
30000 G
50000 EXP
Paralysis IV

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Eryth Sea Side Quests

Click to View List
Quest Location Giver Rewards
Investigating Satorl Ether Plant Miriall +100 Reputation
20000 G
42000 EXP
Poison Defence VI
Ancient High Entia Mystery Ether Plant Talia +700 Reputation
59500 G
93000 EXP
Meteor Staff, Talent Boost V, Melia Skill Tree - Passion
The Missing Boy Ether Plant Miriall +500 Reputation
23000 G
48000 EXP
Ether Protect VI
The Only Thing I Can Do Ether Plant Vidian +300 Reputation
31000 G
56000 EXP
Rex Arms, Rex Greaves
I Will Never Forget You Ether Plant Vidian +300 Reputation
43000 G
72000 EXP
Rafaga Armour, Rafaga Leggings
Secret Research Ether Plant Teelan +300 Reputation
41000 G
68000 EXP
Rex Helm

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Alcamoth Side Quests

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Quest Location Giver Rewards
Vidian Rescue Mission ------ Surprise Quest +700 Reputation
58000 G
97500 EXP
Gracielle Helm, Gracielle Arms, Gracielle Greaves

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Valak Mountain Side Quests

Click to View List
Quest Location Giver Rewards
The Missing Partner Harict Chapel Kurralth +100 Reputation
24000 G
30000 EXP
Empire Pike, Night Vision IV
The Final Giants' Ruins Harict Chapel Zain +700 Reputation
88000 G
1750000 EXP
Damage Heal VI, Arts Stealth VI
The Giants' Treasures Harict Chapel Zain -

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Fallen Arm Side Quests

Click to View List
Quest Location Giver Rewards
Stunted Growth Junks Orkatix +700 Reputation
44000 G
51500 EXP
Agility Up IV, Dunban Skill Tree - Enthusiasm
Transmission Bypass Junks Orkatix -
The Exhaust Pump Junks Orkatix -
The Mini Reactor Junks Orkatix -

Quests in Red Text indicate Timed Quests. As these quests will expire after progressing to a certain part of the game, be sure to complete them while they are still available!

Prison Island Side Quests

Click to View List
Currently no side quests to display. Please check back soon.

Maps and Collectopaedia

Bionis' Interior Map

Lower LevelBionis__Interior.pngEnlarge Upper LevelBionis Interior Upper.pngEnlarge

Bionis' Interior Landmarks and Locations

Landmarks

A Terminal Trachea
B Interior Landing Site
C Spinal Nerve Tower
D Pars Sympathica Tower
E Terminal Nerve Tower
F Upper Trachea
G Heart Entrance

Locations

1 Third Lung
2 First Lung
3 Vein Crossroad
4 Terminal Vein
5 Venous Plexus
6 Third Lung Bronchus
7 Second Lung
8 Aortic Pathway

Heart-to-Hearts

Tap to Close or Expand
Title Location Char. 1 Char. 2 Affinity
Fiora's Body Spinal Nerve Tower Fiora Sharla Pink
Kind Words Terminal Nerve Tower Riki Melia Pink

Bionis' Interior Collectopaedia

Veg Sarsaparilla Black Liver Bean - - -
Animal Blood Worm Azure Mouse Happy Duck - -
Strange Tap Tap Tap High Entia Jewel - - -

Collection Rewards

Vegetables Haste V
Animals Aggro Down IV
Strange Strength Down V
100% Completion Z Speed Goggles

Prison Island Map

Currently unavailable.

Prison Island Landmarks and Locations

Landmarks

A Bridge of Grief
B Prison Gate
C Empty Throne
D Gondorl Cathedral
E Prison Terrace

Locations

1 Damaged Transporter
2 Central Hall
3 First Sanctum
4 Second Sanctum
5 Banquet Hall
6 Kitchen
7 Behemoth Nest
8 Battle Arena
9 Arena
10 Great Canyon
11 Gravina Bridge
12 Corridor of Silence
13 Travalga Bridge
14 Basverg Belfry

Heart-to-Hearts

Tap to Close or Expand
Title Location Char. 1 Char. 2 Affinity
Before the Final Battle Corridor of Silence Shulk Fiora Pink
Journey's End Empty Throne Reyn Riki Pink
Untold Feelings Gravina Bridge Sharla Melia Pink

Prison Island Collectopaedia

Fruit Dry Lemon Death Lychee Hell Raspberry Deadly Kiwi -
Animal Dancing Squirrel Lightning Weasel Angry Monkey - -
Bug Señorita Scarab Emperor Beetle - - -
Nature Absurd Branch Insanity Moss - - -
Parts White Cover Modern Resistor Green Cam Strong Screw -
Strange Blue Glow Blue Blood - - -

Collection Rewards

Fruit Break V
Animals Good Footing V
Bugs Agility Up V
Nature Strength Up V
Parts Ledios Cuisses
Strange Ether Up V
100% Completion Ledios Plate

Tips and Strategies

Area Map

It might be obvious already at this point in the game, but you can fast travel to previously visited landmarks (except landmarks on the Mechonis due to story events). There will be several sidequests that will become available in Chapter 17, and it is highly suggested to just warp to said locations instead of walking around and visiting each area one by one.

The Replica Monados

You will be given a quest by Vanea that makes you look for materials to craft 5 different Monados. This is a good time to invest powering Shulk up before heading to the last parts of the game.

Rebuilding Colony 6

This is one of the best ways to spend your time with before ending the game. Rebuilding Colony 6 will unlock several new quests and shops for you to use that can further strengthen your party.

Boss Strategy Guide

Sureny Telethia

sureny telethia.jpg
Watch out for Soul Read! Disable the Telethia's Soul Read to defeat it. Aura removal arts is a must-have in this fight. The Telethia can use Ether Particles, which is an Ether-based attack and also inflicts Ether Down. Getting hit with the ability twice in succession will prove fatal to your party.

Sureny Telethia Recommended Characters

Shulk Icon Shulk Dunban Icon Dunban Sharla Icon Sharla

Shulk is back in action! He has the best aura removal ability in the game, which is a much-needed move against the Telethia. Just don't forget to equip some gems to Shulk's new weapon. Sharla is also good to have with her Cure Bullet or Cure Round to remove the debuff caused by Ether Particles.

Sani Telethia

Sani Telethia.jpg
The 2nd Telethia fight in succession. This fight is completely different than the first one, as Sani Telethia won't even use Soul Read to defend itself. It has several area attacks that deal heavy damage to units in front of it. Take note of the weather, Sani Telethia will change it at will and its moves will vary depending on the current weather.

Aside from Telethia Buster VII, which is a physical attack, all of it's other moves are ether types. Thunder Bolt and Bolt from the Blue can inflict paralysis, but there are no notable moves that can cause too much trouble to a well prepared party.

Sunny Weather Attacks

Shock Wave and Thunderbolt.

Rainy Weather Attacks

Splash Wave, Sunlight Scatter, and Thunderbolt.

Thunderstorms Attacks

Sunlight Scatter, Bolt from the Blue.

Sani Telethia Recommended Characters

Shulk Icon Shulk Dunban Icon Dunban Riki Icon Riki

Not many debuffs to take note of so Sharla isn't a must-have. Riki and Shulk's heal will be enough to sustain your party's HP in the battle. A good chain attack can also end the fight rather quickly.

1st Disciple (Lorithia)

Lorithia 1st Disciple
Lorithia will summon Nova enemies during the fight. Lorithia's defenses will change depending on the number of enemies alive. Reducing the number of enemies to 2 will allow you to damage her while reducing them further will make her take more damage than usual. Build up your party gauge by using Burst Affinities. When a Chain Attack becomes available, dispatch all enemies, then use it on Lorithia to bring her down.

Lorithia Recommended Characters

Dunban Icon Dunban Sharla Icon Sharla Melia Icon Melia

Lorithia will be summoning Nova type enemies, so adding Melia in the party is a must (setting her as your leader will be even better). Also, make sure to add Blaze, Wind, and Ice to your art arsenal, as attacking the Nova with Area attacks will allow you to dispatch them rather quickly.

Have Dunban take the frontline, then have Sharla take the back and equip her with Thunder Bullet to give your party a good way to dispatch the Novas. Fiora can replace Dunban if you wish to do so, but using Dunban's Blossom Dance during a chain attack can allow you to defeat Lorithia with a single chain attack from full health if you destroy all novas and the multiplier is maxed out.

Master Obart

Master Obart
It can use the Talent Arts Annihilation V and Legendary Claw VII. Blocking these moves with Shield is a must, since Annihilation can inflict topple, while Legendary Claw inflicts high damage and can potentially KO all the targets hit. Do not topple Master Obart, as it will activate its, spike abilities which will damage you whenever you hit it.

What is Spike Damage?

Master Obart Recommended Characters

Shulk Icon Shulk Dunban Icon Dunban Riki Icon Riki

Shulk is the only recommended character, and the other two depends on the player. Just avoid toppling it and keeping Shield up, and the fight will prove effortless to beat.

Dragon King Alcar

Alcar
A big guy with a counter spike ability. Everytime you hit Dragon King Alcar, you will suffer 450 damage. The way to approach this fight will vary depending on the chosen characters for the fight which will be detailed below.

Strategy 1 Spike Defense

If you have the necessary materials, crafting spike defense gems and equipping them to your characters will allow you to approach this fight normally. You can get a maximum of 100% spike defense if you have the necessary gems, so you can ignore Alcar's counter spike ability with this setup and just lay havoc on him.

Strategy 2 Topple Lock

Shulk Icon Shulk Reyn Icon Reyn Dunban Icon Dunban

Alcar's counter spike will disappear if he gets toppled. Utilizing a topple lock party will allow you to beat him up without him being able to counter you at all. This requires a high affinity and high skill levels for your characters, as well as some topple plus gems to be executed properly.

How to Topple | Topple Lock Guide

Strategy 3 Purge

Shulk Icon Shulk Dunban Icon Dunban Sharla Icon Sharla

The default strategy. Purging Alcar's spike ability will allow you to hit him without worry. Just make sure to keep on reapplying purge whenever Alcar recovers it. Adding Sharla to your team will allow you to avoid accidental death with this strategy.

Dickson (2nd Disciple)

Dickson 2nd Disciple.jpg
A two-phase fight. You'll have to bring Dickson's HP down to 50%, then fight him again to defeat him. He has a paralysis spike ability, and is immune to Purge, so using art heavy characters is recommended for the fight. He also becomes immune to topple at low health, so using a topple lock setup might prove disadvantageous in the long run.

Dickson Recommended Characters

Shulk Icon Shulk Dunban Icon Dunban Sharla Icon Sharla

Sharla is the chosen healer in this fight due to dickson's ability to remove debuffs, making Riki's value lower. Sharla can also focus on healing, so paralysis won't be too much of an issue for her. Make sure to position Shulk away from your party to avoid Dickson's Chaos Punish so you can remove the daze from your allies that get hit.

Story Walkthrough Related Links

Xenoblade Chronicles Story Walkthrough

Prologue The Battle of Sword Valley
Chapter 1 Colony 9 and Tephra Cave
Chapter 2 Colony 9 (Mechon Invasion)
Chapter 3 Tephra Cave (Revisited)
Chapter 4 Bionis' Leg
Chapter 5 Colony 6 and Ether Mine
Chapter 6 Satori Marsh and Bionis' Interior (1st Time)
Chapter 7 Makna Forest and Frontier Village
Chapter 8 Eryth Sea, Alcamoth, and High Entia Tomb
Chapter 9 Prison Island (1st Time)
Chapter 10 Valak Mountain
Chapter 11 Sword Valley and Galahad Fortress
Chapter 12 Fallen Arm
Chapter 13 Mechonis Field
Chapter 14 Central Factory and Agniratha
Chapter 15 Mechonis Core
Chapter 16 Central Factory (Revisited)
Chapter 17 Bionis' Interior and Prison Island (Revisited)
Final Boss Memory Space

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    • I've been having trouble with Avalanche Abaasy. Does anyone have tips for that asshollll

    • >>[9]
      In her perspective, you're the shota.

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