To unlock IX Bruno (Zombie Character) in Black Ops 4 Blackout, you need to play find the Lion Pauldron Mission Item, get a takedown with the Combat Axe and complete the match in any place. If you fail to complete the character mission for any reason in one match, you need to find the IX Bruno’s Mayan Crest in the next game again.
IX Bruno’s mission item can be found in Mystery Boxes.
HOW TO FIND THE LION PAULDRON
At the start of the match look out for the light beams that indicate mystery boxes. Land at one of these spots and kill all zombies to unlock the mystery box. The Lion Pauldron has a chance to be one of the items inside the box.
Usually, the required Combat Axe is inside the Mystery Box, so you can directly start working on IX Bruno’s Challenge.