Wardens do not use traditional mob spawning mechanics. When a player activates naturally generated sculk shriekers four times, and there isn't another warden within 24 blocks‌[JE only]‌[upcoming: BE 1.19.10]/48 blocks‌[BE only]‌[until BE 1.19.10], a warden emerges from the ground. The emerging animation lasts for 6.7 seconds.

The warning count for sculk shriekers is specific to each player, not each sculk shrieker. This means that the same player can activate four different sculk shriekers, and a warden still spawns on the fourth activation.

Level: Easy

(This design was handrawn. I hope you like it!)