http://breezewiki.bunny5exbgbp4sqe2h2rfq2brgrx3dhohdweonepzwfgumfyygb35wyd.onion/minecraft/wiki/Sculk_Shrieker
If all 20 spawning attempts fail, a loud roaring sound is played. In Java Edition , if the game rule doWardenSpawning is set to false , naturally generated sculk shriekers behave as if they are placed by a player: they do shriek, but there is no shrieking cooldown, the player's warning level does not increase, no Darkness effect is inflicted, and no warden spawns.