Java Edition 1.17 - Caves & Combat Update

1.17, the first release of the Caves & Cliffs Update, is a major update announced at Minecraft Live 2020 on October 3rd, and released on June 1st, 2021. It is, as stated by Jappa 'the largest amount of work done for a single update', and by Agnes Larsson as '[an] extraordinary challenge [that] Mojang Studios was able to overcome'. This, almost ever since its' appearance on minecraft.feedback.net, has been the most voted suggestion on the website, with over 60,000 votes at the time of the update's announcement. This update overhauls noise that creates cave generation, adds over 30 cave biomes, 9 new ores + 7 new gems (excl. frozen versions of new and existing ores and gems), reconstructs many underground structures such as dungeons or mineshafts, adds in Jeb's combat system, and contains a multitude of other new additions.