Pillager

Pillagers are a subset of illagers.

Spawning
Pillagers do not naturally spawn in any biome, but can be manually spawned by using spawn eggs or the command.

Drops
Pillagers have a chance of dropping a crossbow upon death. Pillagers also drop emeralds on death, dropping more depending on the presence of Looting.

Behavior
Pillagers will attack villages and kill villagers.

Pillagers are armed with crossbows and attack by shooting arrows at their foes. This can lead to pillagers battling other hostile mobs due to an arrow hitting the wrong target, though pillagers will never attack each other.