New biome/dimension (whichever is more fit) if a biome, would add another 254 blocks below where bedrock is now. Bedrock would be replaced by another unbreakable block (with a cracked variant) the cracked variant would be mineable with a rare new enchantment. New general blocks: new stone type w/ Ore variants new Ore: gravitite (would have crafting recipes that can effect gravity live gravity anchor that would change the players gravity when held. 4 sub-biomes in biome/dimension: (new stone type name here) Plains: just a flat plain. Wilttree Forest: Wilttreesw/ ash instead of grass/dirt and new trees. kind of domestic mob would spawn here. Gushing Plains: like first sub-biome but with geysers that shoot anti-gravity versions of water and lava. Crystal Plains: giant crystals would spawn here as well as Crystal Crabs (tameable mobs) w/ variants of crystal that drop shards that are all craftable into wands with different abilities (crabs have these variants too). A hostile mob would spawn occasionally In all sub-biomes that would attack you imitating the last way you died (would have default attack if you haven’t died yet). On the borders of these biomes would be a crack into the void. Bridges would spawn connecting them. Also ancient civilizations would spawn, with citizens trading long lost items that are uncraftable and unfindable anywhere else. Giant pulsing orbs would float in the sky. They would pulse randomly and effect gravity, turning it up or down at different degrees.