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The Warden will come up through the ground and continuously emit the darkness effect, obscuring the player’s vision as it roams. While the Warden is blind, it can detect players based both on smell and vibrations from sound. The more vibrations it detects, the more agitated and, therefore, more aggressive it becomes.
Unfortunately, it only drops a single sculk catalyst and five experience when killed, so it’s not necessarily worth it to spawn this mob often.
Source: https://www.distractify.com/p/how-to-spawn-the-warden-in-minecraft
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