A batarian refugee needs the Pillars of Strength to improve his people's morale. Find the pillars in the Kite's Nest and return them to him at the Citadel refugee camp.
Listen to the batarian preacher who is standing near the entrance of Cargo Hold C in the Docks: Holding Area. You can also acquire it if you scan the planet first. This second way of acquisition is possible even before the Docks becomes available on the Citadel.