Towering Heights

This mod greatly pushes minecraft's maximum world heights (upto ±16384, not this by default), at the cost of X axis (±16.8m blocks) and Z axis (±8.4m blocks). To my knowledge, this is the only mod for newer versions which can reach this sheer scale.

This mod can be used with large terrain generation but generally, heights over 2032 (which is much easier to get) are not very useful.

Warning: This mod uses a lot of ram, allocate around 4-6gb and preferably use ZGC for a smooth experience, and allocate more depending on the other mods used along side this.

Note: Distant horizons breaks above ~6000 blocks and Voxy doesn't work very high up either, and this is a issue I can't fix with just my mod. You will need a custom Distant Horizons or Voxy fork for those extreme heights