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The Cenote Biome in Planet Crafter is an essential step to get the Warden Key Detector as part of the Warden ending of the game. You'll need to find 10 of 13 Warden Keys for that ending, but in order to do that you need the detector. You can also find a golden chest and golden frog eggs here as well, along with a few other things. It's close to the meteor crater but it's a bit hidden and you may want oxygen. This video will make it super easy for you to find.

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