Minecraft wiki entry for Warden, associated text: Wardens do not use traditional mob spawning mechanics. When a player activates any sculk shrieker three times, and there isn't another warden within 48 blocks, and the light level is lower than 11, a warden emerges from the ground. Up to 20 attempts are made to spawn a warden within a 11×13×11 box centered on the shrieker.