One Down is an achievement in Fable Heroes. It is unlocked by purchasing all of the abilities on a single tile of the Abilities Board. This unlocks a tile on the Inner Board of the Abilities Board that allows you to purchase the Multiplier Retainer Perk for 6,000 gold. The Multiplier Retainer prevents the loss of your multiplier when your character is hit.
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Bought all abilities on a single tile. This also unlocked a tile on the Inner Board.