The Marauder is a Heavy Gladiator-type zombie that appears in Call of Duty: Black Ops 4 Zombies mode in the map IX. They later reappear in Dead Ops Arcade 3: Rise of Mamaback in Call of Duty: Black Ops Cold War.
Marauder can first begin to appear around round 8 alongside Destroyers. However, they can also be spawned by summoning them from ringing the gong within each respective shrine to summon the champions of said God, which can be either Marauders, Zombie Tigers or Destroyers. Like Destroyers, Marauders will spawn like normal zombies and can enter through barricades or from the portcullis gates throughout the map during special rounds.
Marauders are much more aggressive than Destroyers, albeit with less health and less armor. They deal more damage and can easily close the distance between a player and themselves by leaping towards them but lack any sort of traditional range attack. After leaping towards a player they will wildly slash at anything in-front of them, dealing rapid damage.