One Dimension

OneDimension

The Nether, the Overworld and the End — stacked into a single dimension.

OneDimension adds one new world type. Select "One Dimension" when creating a
world and you get all three vanilla realms fused into one literal dimension, stacked
by height. No portals to separate dimensions — dig down far enough and you punch
through into the Nether; build up high enough and you reach the End. It's all one
continuous world.

How it's stacked

From bottom to top, in a single 1536-block-tall dimension:

The Overworld keeps its exact vanilla coordinates, so everything you know still works
at the heights you expect.

What you get

• A real stacked world — genuine Nether, Overworld and End terrain, each
  generated by vanilla worldgen, in one dimension.
• Per-band biomes, mobs, features and structures — End cities and Nether
  fortresses generate in their bands and /locate finds them. Nether basalt/fire/
  fungus and End chorus all grow where they should.
• The full dragon fight — the bedrock fountain and all ten spikes build high in
  the End band, the dragon spawns, fights and dies as normal, and the end credits roll
  when you enter the exit portal.
• In-world portals — End and Nether portals warp you within the stacked
  dimension (up to the End platform, down to the Nether) instead of to a separate one.
• The Void Gate — an escalating-damage band (with a hard death zone) between the
  surface and the End, so reaching the top is a real journey — lifted for good once you
  defeat the dragon, opening a walk-up route to the End.
• Real Nether lava — flows fast and far in the Nether band, just like a normal
  Nether; Overworld lava stays slow.
• Vanilla-accurate dimension quirks — beds explode in the Nether and End bands (but
  work in the Overworld), and the Overworld band has a normal day/night cycle and working
  clocks.
• A dig path to the Nether — break through the mineable obsidian floor to descend.
• Correct atmospherics per band — Overworld lighting, sky, fog and rain; the End has
  its proper dark sky and fog with a full view distance; an ominous near-black fog in the
  Void Gate between; no clouds up top; a brighter Nether. The dragon only shows once you're
  up in the void zone or the End.

Admin controls

OPs can tune the Void Gate's hazards on the fly:

• /onedimension menu — a chest-menu panel (works on a vanilla client) with toggles
  for the void damage and the instant-death band.
• /onedimension voidgate damage|deathband <true|false> — toggle each hazard
  independently from the command line. Both are also editable in the config file.

Known issues

• It's a tall dimension, so it's heavier than a normal world. Allocating more RAM
  (4 GB+) is recommended, especially at high render distances.

Starting a server

Make sure to set the level-type to onedimension:one_dimension and delete the existing world, start the server and it should generate a one dimension world.