Dark Souls 3 - Where to find the blade of the Darkmoon Covenant + Painting Guardian set
It is located in Anor Londo, at a tower accessed by walking over an invisible path from the rotating platform. The rotating stairs can be in any position. If it is at the top (allowing access to Anor Londo) go to the bottom of the stairs, and if it's at the bottom go to the top. There's a bonfire on a platform of the tower directly in front of you on the broken path, just walk through the air straight ahead of the platform exit. Do not deviate from the path until you are perpendicular to the bonfire, then go 90° to your right, and you will land safely next to the bonfire. (There are invisible walls around the walkway so you cannot actually fall down at the wrong place.)
You must have learned the "Darkmoon Loyalty" Gesture from Sirris of the Sunless Realm.
Alternatively Company Captain Yorshka can be killed to retrieve the covenant item required to join. You will not however be able to turn-in covenent items for rewards until the next NG.
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