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That currency is part of Celestial Dungeon system, which will become available a bit later. Since the goal of this dungeon difficulty is to receive LFR gear makes sense LFR itself will also reward this currency. If you would complete LFR now - yes, you would receive this currency. The vendor can be found in Shrine of Two Moons / Shrine of Seven Stars. For now you should not think how to farm this currency, news will come once content is released