This Assignment can be accepted once you speak to Wrex enough times aboard the Normandy. It takes place on an Uncharted planet that you must explore with the Mako.
How to Begin
While on-board the Normandy, you’ll find Wrex down in the cargo hold. When speaking with him, he’ll eventually open up about some family armor that was lost. He’s managed to find the location of it and asks if Shepard will assist him, beginning the Assignment.
Find Wrex’s Armor
Once accepted, use the Galaxy Map and plot a course for the Phoenix system in the Argos Rho cluster, there you’ll find the planet Tuntau. Ensure Wrex is in your squad and then once planetside, make your way to the south to find the Hidden Structure. You’ll need to dispatch some Pirates first, use the Mako’s Primary Cannon to make short work of them and then enter the base itself.
Once you enter the main room, you’ll be up against a group of pirates, two snipers and Tonn Actus himself. As with most encounters, you can make this more favorable by getting their attention and luring them back to the entrance, there you can use Biotics to disable them and easily pick them off. You’ll have to venture back into the main room to deal with the snipers, but you can rush these to eliminate any major threat from them. Tonn Actus is little more than a regular Pirate that will use Immunity at will.
With the area clear, make your way upstairs to find a room full of loot and of course, Wrex’s Armor, completing the Assignment. This will earn Wrex’s loyalty and aid you with the choice on Virmire later in the game without the need for a high Charm or Intimidate score.