Minecraft wiki entry for Raid, associated text: There's a 50% chance of spawning either a additional Pillager from 3 Pillagers per wave, and/or a Vindicator on each wave. Witches can also spawn, but they only spawn with a 50% chance on Waves 3, and 5, but excluding Wave 4, only then will Wave 4, spawn 3 Witches respectively. A Ravager also spawns at Wave 3, but if there is an extra wave, there's a chance of 2 Ravagers in the extra wave- without them being a Pillager-Ravager Jockey, only Wave 5 spawns a Pillager-Ravager Jockey.