Of the Occult (Umbreon) in The Obsidian Oath

Umbreon has the best physical bulk of any Eeveelution, so it naturally gets handed the role of being a Fur Coat Wall. Rocky Helmet shreds the Pixilate Population Bombers that infest the low ladder of Bh, so it is the item of choice here. Lastly, the set's Take Heart strat gives it status resilience and allows Umbreon to act as a fully improofed late-game wincon.