If you continue to speak to Wrex he’ll eventually tell you about his past. This includes his desire to reclaim his family’s armor, here’s its location. The armor can be found in the Argos Rho cluster in the Phoenix system on planet Tuntau. The base is on the lower left side of the map. If you have Wrex in your party he’ll make note of the armor but you can grab the armor before this. If you get to the location before Wrex informs you of the armor he’ll have unique dialogue. The area is heavily guarded but you can take cover at the entrance. The enemies will not go beyond this point but only Tonn Actus is a challenge, the rest of the pirates is easy to take down. The armor is upstairs and once you collect it Wrex will be grateful for your actions.