Raids in Minecraft: how to trigger, survive and win one
Drink an Ominous Bottle and walk into a village:

The Ominous Bottle is a drink that gives the Bad Omen effect, used to start raids and ominous trials.
It cannot be crafted; it can be found in chests.
Raid captains drop it, and trial chamber vaults hold some; its strength ranges from I to V. Drinking it gives Bad Omen: entering a village turns it into Raid Omen and starts a raid, and entering trial chambers turns it into Trial Omen. Milk removes it.
This item has no crafting recipe.
Drink an Ominous Bottle and walk into a village:
their captain's Ominous Bottle starts a village raid.
An ominous trial starts with Bad Omen, and Bad Omen comes from an Ominous Bottle.
It can be found as loot in Trial Chambers. It is dropped by Pillager.
It starts raids and ominous trials. Effects: Bad Omen, Raid Omen (Bad Omen) and Trial Omen (Bad Omen).