From Lexicanum

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Chaos Predators are the most ancient examples of the Predator tank, seeing combat during the Horus Heresy, and still in service ten thousand years later. Their hulls however are mutated and barely recognisable, covered in Chaotic runes and with every barrel adorned with daemonic maws.

They can be armed with either an Autocannon or twin-linked Lascannons on the turret and may have a pair of Heavy Bolters or Lascannons on the side sponson mounts. They are armoured in the same way as Imperial Predators, however often they are possessed by daemons, giving them a resilience others lack.

While the Imperium categorizes differently armed Predators with pattern names according to their turreted weapon, Chaos Marines do not bother with such things.

Sources

• Codex: Chaos Space Marines (3rd Edition, 2nd Codex)