IX (pronounced Nine) is the second Zombies map featured in Call of Duty: Black Ops 4, and the twenty-sixth map overall. Chronologically, it is the third map in the Chaos story. This map introduces two new special enemies: the Destroyers and the Marauders.

The numbers, Mason! What do they mean? Jason Hudson. Ascension is a term used to refer to the number "codes" seen in Call of Duty: Black Ops. These codes contained encrypted orders and were broadcast via number stations to Soviet sleeper agents throughout the world, including Alex Mason.