If you are looking for this version specifically, it introduced: New Blocks : Deepslate, Copper, and Dripstone. : Axolotls, Goats, and Glow Squids. : The Spyglass and Lightning Rods.
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The Minecraft 1.17 update, also known as the Caves and Cliffs update, brought significant changes to the game. Here's a brief overview: If you are looking for this version specifically,
If you just want the (not the exact version number): it introduced: New Blocks : Deepslate