Minecraft wiki entry for Raid, associated text: Valid spawn blocks include full blocks, upside-down slabs/stairs, soul sand, and packed/blue ice, but not glass, leaves, some light-emitting blocks (they do spawn on crying obsidian and jack-o-lantern), trapdoors, regular ice, bottom slabs, or carpet. In Bedrock Edition the raid can spawn on any block except leaves and scaffolding. Any light level is fine and player proximity does not matter. Waves tend to spawn near or at the last location they spawned at. The location must be in an entity-ticking chunk. If the game is unable to find a spawn location, the raid ends. Once a valid location is found, the horn sounds and all raider mobs for that wave spawn there at once. They then spread out and move toward the village. Once all raiders are killed, there is a 15-second cooldown before the next wave. However, if the last raider happens to move outside a spherical radius of 112 blocks from raid center, or the entire wave spawns outside that radius (which can happen with large differences in Y-level), then the next wave spawns immediately. Raiders that are part of a raid do not despawn naturally and do not contribute to the mob cap, but resume despawning once the raid is over or they leave it.