Minecraft wiki entry for Raid, associated text: When triggered with Bad Omen I, illager weapons are unenchanted. Bad Omen levels II through V each increases the possibility of low-level enchantments. There is a 25% chance of spawning an additional Pillager from 3 Pillagers each wave, totaling 4 Pillagers on Waves 2, 3, and the Extra Wave. And a 25% chance of spawning a Vindicator each wave, starting Wave 3.