Pillager

Pillagers are a subset of illagers that raid villages, along with illager beasts.

Spawning
Pillagers do not naturally spawn in any biome, but can be manually spawned by using spawn eggs or the command. It will most likely be that if a player is within a village, there will be a certain chance that a Pillage will begin to spawn which will contain Pillagers and Illager Beasts.

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. A bug exists where after a target is dead, the pillager will keep shooting at nothing, constantly, not very far, and occasionally backwards.