The "A Bulwark Against Darkness" quest in The Blood of Dawnwalker will leave you with a shiny new heavy legendary armor set. Of course, in Coen's world, things are never easy; to obtain the Arbiter's Armor, you must collect four incredibly rare components. Since you won't get more than a few vague hints about their location, it can easily take hours to complete the Arbiter Armor set…
Polygon.com
'A Bulwark Against Darkness' quest walkthrough in The Blood of Dawnwalker
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