Ravager

"If you take a cow, make it angry, and strap a crossbow-happy Pillager to its back, what do you get? You get a very confused cow. But if you were a development team looking to make a new threat for Minecraft – one that looks a bit like a cow with serious anger issues – you would get The Ravager."

- Ash Parrish

Ravagers are large bull-like hostile mobs that spawn in raids.

Java Edition
Ravagers can spawn starting at wave 3 as part of raids.

Bedrock Edition
Up to 5 Ravagers spawn as part of a raid. Unridden ravagers spawn at waves 3 and 5, a ravager ridden by a pillager spawns at waves 5 and 7, and a ravager ridden by an evoker spawns at wave 7.

Behavior
Ravagers are hostile towards players, iron golems, villagers or adult villagers, and wandering traders within a 32-block radius in Java Edition or 16-block radius in Bedrock Edition. They attack by ramming enemies with their head, dealing damage and high knockback. They can also destroy certain block types by charging into them.

If blocked by a shield while attacking, no damage is dealt and knockback is halved. The ravager has about a 50% chance to become stunned and unable to move or attack for around 2 seconds. After this period, it will emit a roar that deals damage and high knockback (which increases with proximity) to nearby entities. The roar can knock back nearby Illagers without damaging them and has no effect on other ravagers. The ravager does not attack pillagers who shoot at it and does not attack evokers when evoker fangs accidentally hit a ravager. There is a 50% chance that when blocking with a shield a ravager will still be able to do damage once its half health.

Even though they are heavy, they can swim. Their apparent weight gives them 50% chance of 100% knockback resistance.

Ravagers if being ridden by an illager will dismount its rider if it moves into water deeper than two blocks.

Ravagers are also able to spawn reinforcements.

Drops
Upon death, a ravager will always drop one (1).

Entity data
Ravagers have entity data associated with them that contains various properties of the mob.

Trivia

 * "Ravager" and "Behemoth" were listed as alternate name suggestions for the Illager Beastt. In Java Edition snapshot 19w05a and Bedrock Edition beta 1.11.0.1, Illager Beasts were renamed to Ravagers.
 * In Java Edition 3D Shareware v1.34, Ravagers drop yellow keys.
 * We know Ravagers and Iron Golems have exactly 50 hearts of health. But in a 1v1 battle between the two, the Iron Golem will win.