Patrol

Illager patrols are common naturally spawning groups of pillagers, vindicators, and illager beasts.

Spawning
Illager patrols spawn as a group on top of sand and grass blocks of five mobs including an illager beast, plus a maximum of four other pillagers (weight 55) or vindicators (weight 27) up to five blocks away from the illager beast, one of which is the patrol "leader", which usually will ride the illager beast.

Illager patrols spawn 200 blocks away from villages in plains, taiga, desert and savanna biomes, as well as their variants.

The patrol leader will wear an illager banner on their head.

Behavior
Illager patrols will circle inwards to villages and then proceed to attack the village and kill villagers and iron golems.

The patrol leader can ride the illager beast and always drops an illager banner upon death.