"Earth Mantle" - MC mod idea WIP

World Changes:
    Maximum world depth increased to -128.
    Bedrock layer is more elaborate and less flat. Caves can generate in it (or extend into it), but are always filled with lava. Thick (circumference of dozens of blocks) bedrock spikes can extend past the standard upper limit of bedrock spawn and also below its new lower limit around -110 up until -126.
    Lava will fill any caves naturally generated within the bedrock layer. Bedrock caves must not extend past the soft limit of -110.
    All lava sources that are generated specifically within the bedrock layer (enclosed) behave like the Nether lava in terms of spread and speed. Also applies to lava placed manually with buckets, so long as it's beneath the default lava aquifer limit.
    Reintroducing the "Void fog" that was removed in 1.8.0.
    Water sources dry up immediately like in the Nether. Wet sponges also dry out if placed.
    The typical overworld void is exchanged for an infinite Mantle lava pool (yellower in color with black spots), starting past the soft limit of -110 in any space unoccupied by bedrock blocks.
    Addition of new liquid, Mantle lava. More properties for it below.


Tool Changes:
    Netherite pickaxes can be infused with a wither star to give it the ability to break bedrock. Break time with Efficiency V would be 15 seconds, similar to an unenchanted diamond pickaxe breaking obsidian.
    A pickaxe will lose 1 durability for every 10 (maybe?) ticks spent mining bedrock rather than whenever you break a bedrock block. It's a damn tough material. Unbreaking enchantment mitigates this.
    Due to bedrock hardness, eligible tool reach is limited to two blocks away from the player at most.


Block Changes:
    Each bedrock block needs to be broken once before it will truly break. The first break turns it into a "cracked" variant. A beacon with Haste nearby is recommended for meaningful progress.
    Bedrock blocks (any variant) cannot be broken in any way if the pickaxe has "Silk Touch" on it, and the bedrock block itself will not drop.
    Some bedrock blocks will spawn "lavalogged", emitting particles similarly to crying obsidian, but red. If cracked, they will spill (Nether) lava with themselves as the source block. When destroyed, the lava source inside remains.
    Lavalogged bedrock spawns in clumps surrounding lava-filled cave formations in the bedrock layer but also individually, similar to the lava pockets in the Nether (but *much* more frequent the deeper you are).
    Bedrock blocks can generate with certain ores and crystals embedded in them in rare and thin spaghetti veins. Eligible resources include iron, diamonds, emeralds. Other modded gems would also form more abundantly here.
    Resources inside bedrock blocks can drop twice, once when cracked and again when destroyed. Resource drops are tripled (may require balancing per-ore). Relevant enchantments still apply.


Mob Changes:
    Typical mobs still cannot spawn on bedrock blocks, though they could navigate to the bedrock layer if following a player from elsewhere.
    New Nethermite mob that infests (uncommonly) lavalogged bedrock. It can spawn from any lavalogged bedrock (cracking it in the process) but cannot tunnel through regular bedrock. They only appear when their block is exposed to air. The same block cannot spawn more Nethermites once cracked.
    Nethermites behave the same as Silverfish, but apply burning ticks if you're bit as if you fell in lava. They also do considerable durability damage to the armor piece bitten. Diamond armor could lose up to 10% of its max durability per hit, Netherite up to 7%. Properties of the Nethermite would require balancing ingame.


Mantle Lava Properties:
	Mantle lava deals "pressure" damage similar to the regular void only when the player is submerged, ignoring any fire resistance and applying a burning effect on screen.
	Source blocks of Mantle lava cannot be blocked by placing some other solid (or otherwise) block in their place. If placed in its path of flow, it will be destroyed. Only bedrock and barrier blocks can replace/stop mantle lava source/flow.
    If Mantla lava flows sideways into an empty space, it will spread at the speed of Nether lava. The flow nearest to the source will turn itself into a mantle lava source block in 20 ticks. Mantle lava can flood an entire layer this way.
    If a player touches Mantle lava they will start a Mantle fire tick that behaves the same way as lava, but it has conditions:
      1) If the player is not fully clad in netherite armor, any non-netherite armor is immediately destroyed. The player takes double the damage of regular lava per Mantle lava fire tick.
      2) If the player is fully clad in netherite armor though, fire resistance enchants are half as effective and all armor takes durability damage similar to that of diamond armor in regular lava fire ticks (non-enchanted).
    In addition, any item held in the main or off hand during a Mantle lava fire tick will be destroyed if it's not made of netherite. Netherite tools will similarly take damage like in the aforementioned condition.