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The Warden is an extremely powerful hostile mob that can kill you in one hit, unless you wear Netherite armour. However, it has a key weakness that you will need to exploit if you want to escape alive.
The Warden is blind, meaning it can only locate you by following sounds. If you want to survive an encounter with this fearsome foe, you need to sneak around until you find an exit. Even Mojang themselves say you shouldn't fight Wardens, describing them as "more like a natural disaster" than a traditional boss.
You’ll know when the Warden is close, as nearby candles and other light sources will start to flash. If the Warden is nearby, you can distract it by throwing something to make noise. For example, if you fire an arrow or throw a snowball, the Warden will investigate the sound and give you a chance to sneak away.
As the Warden is so powerful, you should avoid fighting it at all costs. If you do decide to attack, the Warden will grow in power and become even more formidable. Killing players wearing full Netherite armour in two hits is bad enough, so please don't make this any worse. Just make sure you have some snowballs around instead.
A good defense to use in order to avoid fighting the Warden is to sneak or throw projectiles such as snowballs or arrows to distract it, which was shown during the Minecraft Live 2020 event. It was shown in the reveal that the Warden will be attracted to projectiles that produce a sound. However, fighting the Warden is not recommended, as it does a lot of damage. Mojang developers also stated that this mob is not meant to be fought, but rather is meant to scare players.
The Warden seems like it gets faster when attacked, and it deals so much damage that it can kill a player wearing full netherite armor in two hits (any weaker armor or no armor will result in the player being killed in 1 hit).
Assuming that’s even possible, we don’t know yet what can be earned by defeating a Warden, but expect that to be the topic of many Minecraft videos in the near future. You’re better off sneaking around the Warden and seeking out some of the high-tier loot likely to be scattered around The Deep Dark, but if we can’t convince you not to try, we wish you luck and we’ll provide whatever help we can once the Minecraft Warden launches in 2022 and we can get our hands on it--or it gets its hands on us.