Minecraft wiki entry for Raid_captain, associated text: Raid captains usually act the same as if they were a normal illager, but other illagers follow behind them (except for outpost captain), and usually the captain takes the lead ahead of the other illagers. Once a raid captain is killed by a player, the player is inflicted with 1 level of the Bad Omen effect, which can cause a raid to occur if they enter a village (unless the raid captain actually spawned in a raid, in which case it does not give a Bad Omen). The captain drops its ominous banner as well; another illager nearby can pick it up to become the next captain.