"Solus Bound" Title?

I randomly unlocked the title Solus Bound after completing a multiplayer match… The description doesn’t give any info. Why did I get this?

Got to level 25 I think

That’s when I got that title. lvl 25

Thanks guys! I just realized I’m at 25.

Every 25 levels you get a title like this. At 100 it’s “Battleborn” I believe.