Matras says that he will be passing the Base Tower on his way to the Steel Citadel, and he has asked you to distract the guards so that he can pass more easily.
Matras says that he is going to pass Base Tower in order to go to Tower of Steel Citadel, and he asks you to eliminate the guards there and draw their attention to you. More specifically, he says that he will give you something nice if you kill them and collect 744 Red Stones.