Tonn Actus
From Mass Effect Wiki
Tonn Actus is a turian pirate who specialises in collecting krogan armor and artifacts, especially anything from the Krogan Rebellions. Wrex hates him because Wrex's family armor, passed down from generation to generation, is part of Actus' collection.
Wrex had planned to look for Actus in the Phoenix system to recover his armor, but Actus has several bases scattered around and Wrex's travels with Commander Shepard have delayed his search. His best lead is the planet Tuntau. Shepard can volunteer to go to Tuntau and recover the armor from Actus: if Wrex comes along, he and Actus recognise each other and trade insults while Actus' men attack. Eventually Tonn Actus is killed in the firefight, allowing Wrex to retrieve his armor.
