Ominous bottles are a drop from pillager raid captains in Minecraft 1.21. Drinking an Ominous bottle grants the Bad Omen effect, leading to a village raid or an Ominous trial.
To get an Ominous Bottle in Minecraft, you can defeat a pillager holding an ominous banner or find one in a pillager outpost. Consuming an Ominous Bottle activates different effects depending on your location, such as turning trial spawners into ominous trial spawners or starting a raid on a village. The main reason to use an Ominous Bottle is to obtain better loot while exploring Trial Chambers.
