He was the final boss, /v/.

But you just don't understand how serious this was.

This isn't just some random Marauder that popped out of nowhere, this Marauder waited to fight you from the very beginning.

All this time, he waited for you, but he was just unable to fight you from countless delays and interruptions.

He knew you were coming back to earth, so he trained and trained to get his chance to kill you.

From games, Mass Effect 1 and 2, he was finally able to face you in the end of 3.

Even if he lost, he would at least know that you were his final opponent.