Orokin Ducats are a currency required for purchasing items sold by Baro Ki'Teer, such as special Mods, or exclusive Weapons. In addition they are used for the final Conclave sacrifice. Ducats can only be acquired by selling certain Prime parts and blueprints at the Void Trader's Kiosks found in the Relays. These parts and blueprints, in turn, are acquired from Void Relics, or from trading with other players. Note that while accessing Baro Ki'Teer is time limited, the Void Trader's Kiosks can be accessed at any time.