Patrol

An illager patrol is a naturally spawning group of illagers.

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 can spawn in plains, taiga, desert and savanna biomes, as well as their variants.

Only the patrol leader will have an illager banner on their head.

Behavior
The patrol leader can ride the illager beast. Patrols will seek out villages and attack villagers. The patrol leader always drops an illager banner when dying.