Make the deepslate part of the world more dangerous

  The cave update added the deepslate part of the world, as it increased the world depth, but currently the only dangerous it offer from the regular cave part of the world is slighly harder blocks to mine, i think it could have even more challenges to make it harder to navigate as it would be a layer where valuable ores such as diamonds and gold could be found more often
  First of all, make it have an increased darkness, so we would have to use more torches or use more potent light sources instead and would be harder to spot any nearby danger, deep dark cave biome might be exclusive from this part of the world, along with the warden, but what about more exclusive structures and mobs? like a magma cave