Seeking Spirit Stones Walkthrough - Nioh 3

Thomas Glover said that a great number of yokai are gathering at Yasaka Shrine, and that an equally great number of Spirit Stones are there. I have been asked to dispatch the yokai and obtain the Spirit Stones. First, I should make for Yasaka Shrine.

Note: This is only available after finishing the Main Mission, Accursed Temple and finishing the Sub-Mission, Beast of the Underworld.

[1] Talk to Thomas Glover.

Yokai are congregating at Yasaka Shrine. Donald suspects this is due to the large number of Spirit Stones accumulated there. He wants you to retrieve the stones and join the loyalist in defeating the yokai.

[2] Head to Yasaka Shrine.

Go to the Yasaka Shrine and capture the Enemy Base.

[3] Purify the corrupted barrier.

The purification fails. Kurama Tengu suggests to go back in time and investigate Yasaka Shrine so that the talisman can gain back its power.

[4] Travel back to the Heian period and investigate Yasaka Shrine.

Fast travel to Yasaka Shrine: Nishiro Gate. Talk to Himiko and she will tell you some Onmyo mages are up to no good.

Go to where the Corrupted Barrier was and defeat the Onmyo mages.

Defeat all the yokai. You might have fought Ryomen Sukuna before in the Myth, Fated Land, or the Sub-Mission, The Mystery of Rajomon.
If not, here are some tips in dealing with them!
・Mind that there are other yokai in the mix this time around
・You can try using the aggro on Himiko/Suzuka Gozen from Sukuna to your advantage when they're not looking
・If the aggro is on Himiko, attack the blue side, otherwise, stick to attacking the red side in close quarters
・Watch out for when they spin their upper body!
・Avoid the large AoE attack from arrows when you see Ryomen Sukuna aim their bow and arrow at the sky

[5] Purify the corrupted barrier and talk to Himiko.
・She will give you the White-green gemstone

[6] Go back to the Bakumatsu period and talk to Thomas Glover at Yasaka Shrine.

・Ninja's Locks
・Vengeful Spirit Mask