The Unbreakable Gosaku is a Mythic Side tale in Ghost of Tsushima. This walkthrough will guide you through all objectives of the The Unbreakable Gosaku Mythic Side Quest.
The Unbreakable Gosaku is unlocked when you’ve completed A New Horizon.
Mythic Tale: The Unbreakable Gosaku
Act: 2
Region: Toyotama
Quest Giver: Yamato
Requirement: Complete A New Horizon
Rewards: Moderate Legend Increase, Gosaku’s Armour
Mission Info: I heard the musician in Akashima Village. Perhaps he has a tale worth hearing.
Objectives:
- Sit to hear the Legend of Gosaku
- Obtain the six keys from the six farmsteads
- Travel to the hill in Akashima
- Defeat the Mongols
- Unlock the path to Goasku’s armour
- Travel to the top of the hill
- Collect Gosaku’s armour
Starting Location: The Unbreakable Gosaku
Sit to hear the Legend of Gosaku
Approach Yatamo and press 
to hear the tale from him.
Obtain the six keys from the six farmsteads
You now need to visit six farmsteads across Tsushima and liberate them from the Mongols. These are denoted by a red diamond with a wheatsheaf symbol. There are four in Izuhara; Aoi, Kuta, Ohama and Yagata, with two in Toyotama; Koshimizu and Iijima.
The farmsteads work almost identically to outposts. All of them involve rescuing hostages (usually 3 or 4) by killing all surrounding enemies and freeing them with . After the last one in a farmstead is rescued, you’ll get a cutscene where they give you the key for that farmstead.
Travel to the hill in Akashima
Unlike in previous Mythic Tales, the marker here will take you directly where you need to go without searching.
Defeat the Mongols
Of course, the game couldn’t possibly let you go one mission without having to kill a bunch of these guys. A group of about 10 will be waiting to ambush you, so deal with them accordingly.
Unlock the path to Goasku’s armour
Right by the place where the Mongols attacked you, you should see a stone gate which you can unlock with now we found all the keys.
Travel to the top of the hill
Use a combination of your grappling hook and rocks to swing and climb up the hill, just like you do for the platforming sections of the shrines.
Collect Gosaku’s Armor
Open the box in front of you to claim your prize – Gosaku’s Armor – and end this mission.
This finishes The Unbreakable Gosaku quest in Ghost of Tsushima.
For all other Quest Walkthroughs, check out our complete Ghost of Tsushima Walkthrough (All Tales).
This is kind of weird. I went to Act 2, but liberated six farms on the south island. I got six keys and went to the gosaku quest and now I have to visit six farms (middle island) to get the keys again. I did one, got a key but still have six in my inventory.