Sekiro Shadows Die Twice How to Get Purification Ending (Complete Step by Step Guide). Unlocking the Purification Ending also grants the "Purification" trophy or achievement.

Step 1: When talking to Owl on the tower roof of Ashina Castle you must pick the 2nd dialogue "Break the Iron Code, stay loyal to Kuro". Meeting Owl is an unmissable part of the story after having defeated Corrupted Monk and Guardian Ape.

Step 2: After defeating Owl eavesdrop on Kuro from behind a corner in his room (if it doesn't let you, exhaust all dialogues with Kuro first and rest at idol, then retry)

Step 3: Rest and head upstairs to talk to Emma about Kuro, pick her 1st dialogue "I agree. Kuro cannot be allowed to die."

Step 4: Rest and talk to Emma again

Step 5: Head to Old Grave Idol, go left immediately to the graves and talk to Emma again

Step 6: Head to Dilapidated Temple (Sculptor) and eavesdrop on Emma and the Sculptor from behind the building

Step 7: Confront Emma (still at Dilapidated Temple) and exhaust all dialogues to receive "Father's Bell Charm" from her

Step 8: Use the bell at the Buddha statue that brought you to Hirata Estate earlier in the game (the statue is inside the Sculptor's House at Dilapidated Temple, to the left of where Emma is standing). This will teleport you to a different version of Hirata Estate with new bosses.

Step 9: Beat Owl in Hirata Estate, he drops an Aromatic Flower (aka Everblossum). You find Owl at Hirata Audience Chamber idol, in the same room Lady Butterfly main boss was in.

Step 10: Follow the story progress up until the final boss fight against Isshin the Sword Saint. After beating him choose to give Kuro Divine Dragon's Tears + Everblossum. You should back up your save game after defeating the Sword Saint endboss so you can reload it for the other endings.