Nioh and Nioh 2 (including all DLCs) are also bundled in the Nioh Collection on PS5.
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Gasha-Dokuro Boss Guide
Williams encounters the thirtieth boss Gasha-dokuro in The Source of Evil Main Mission.
Before you engage him in battle, examine each of the 3 red crystals first.
Speak to the mage at the beginning to obtain an item. Proceed to check for all 3 red crystals first, then use the item to turn alter them to an orange color. What these do are the glowing spots enable you to replenish the activated Living Weapon.
As soon as the battle starts, attack either Gasha-Dokuro’s feet or hands since those are his weak points. For each time you destroy a weak point, he begins to rest his head on the peak of the mountain. Head to the apex of the mountain, then immediately deal several strikes to his skull from the cliff. Rinse and repeat this step for at most 4 times.
An alternative is to utilize the Living Weapon. If William positions on the glowing patches, this replenishes his Living Weapon provided that you have done the 3 crystal prerequisite mentioned above. The best Living Weapon to use for this battle is one endowed with the Wind property.