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From City of Heroes: Rebirth - Wiki
This enhancement cannot be bought from stores. It must be obtained by purchasing it from a Reward Merit Vendor, an Alignment Merit Vendor, or an Incarnate Merit Vendor as an Archetype Enhancement, from another player at the Auction House, by trading, or as a random reward from Super Packs.
This enhancement may be sold to a store for ??. However, other players may be willing to pay more for it through the Auction House.