Prerequisites
You do not have to finish all the side stories, but once you start the end of the game and EXTRA stories, you have to finish it before you can go back to doing side stories. You also have to be careful not to initiate the Epilogue or you won’t be able to finish the side stories on that file.
Note: For the final boss, it’s recommended that your party be at least level 60 with the best equipment possible. It’s recommended that you obtain said best equipment possible before initiating the ending/extra stories.
To Start
After the cutscene, you’ll then have access to all eight characters and can change the party through the main menu anytime. It’ll be suggested to just wander the world until you find clues. Lucky you for you, I’m going to save you some time with this guide.
Four Locations of the Flame
Flamechurch
Fight Arcanette. Weaknesses: Polearm, Axe, Lightning, Ice
Go up to the cathedral. You can find Tanzy’s Journal. Have Temenos and Throné in your party, then use the Shiny Mirror in your inventory at the torch where the blue flame should be.
Tombs of Wardenbeasts
From Beasting Village, make your way east to the tombs. At the end of the dungeon, you’ll have to fight a boss.
Fight Grotesque Monster. Weaknesses: Axe, Bow, Ice, Light
Have Castti and Ochette in your party, then use the Shiny Mirror at the torch.
Fellsun Ruins
Go east from Crackridge to get to the ruins. Within the ruins, gather 17 Journal Fragments. Have Partitio and Osvald in your party, then use the Shiny Mirror in your inventory at the torch.
Tranquil Grotto
From Ku, you can make your way east to the Tranquil Grotto. Have Hikari and Agnea in your party, then use the Shiny Mirror at the torch.
Once all four blue flames are ablaze, the final dungeon opens up.
Final Dungeon: Vidania
Vidania Castle is straightforward. Literally just go up the stairs.
Final Boss
This fight will make use of all eight party members. About halfway through the fight, Vide will swallow up the first four party members, forcing you to use the next four.
Fight: (Some weaknesses are missing due to me defeating stuff too quickly.)
Vide. Weaknesses: Sword, Axe, Staff, Lightning, Light – Weaknesses (Changed): Bow, Fire, Darkness,
Wriggling Tentacle. Weaknesses: Polearm, Axe, Bow, Ice, Light
Creeping Tentacle. Weaknesses: Sword, Dagger, Bow, Staff, Fire
Thwarting Tentacle. Weaknesses: Sword, Polearm,
Lithe Tentacle. Weaknesses: Fire, Ice, Lightning, Light
OH, BUT THAT’S NOT EVEN MY FINAL FORM!
Fight:
Vide the Wicked. Weaknesses: Sword, Dagger, Bow, Wind, Light
Wicked Left Arm. Weaknesses: Sword, Axe, Bow, Staff – Weaknesses (Changed): Sword, Polearm, Dagger, Bow
Wicked Right Arm. Weaknesses: Fire, Lightning, Light, Dark – Weaknesses (Changed): Ice, Wind, Light, Dark
Epilogue
The epilogue can be initiated at Southern Cropdale Trail, at the same spot where the ending started. Examine the campfire. Wait for the credits to finish.
Finish all side stories (or anything else) before going to the Epilogue.
 
That’s all we are sharing today in OCTOPATH TRAVELER II True Ending Guide & Extra Stories, if you have anything to add, please feel free to leave a comment below, you can also read the original article here, all the credits goes to the original author Ceaseless Duality
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