• Iris now supports the new default world height, however it will generate in whatever the world height is defined as. Iris internally now generates between 0 to (max - min). So for the default it's generating 0 to 384, then on output is sinking the terrain down by 64 blocks (or whatever the min height is set to). The reason this is important is because the studio still works on the premise that 0 is the bottom of the world (even if it might be -64)
• Fixed several issues that were causing resource load errors, and it should make the engine start up a bit cleaner now
• Added a lava layer, any cave ravine or cavern will now have lava up to a certain layer. You can change this in the dimension, the default is 8 blocks up
• Along with the 1.18 upgrade, Iris has migrated to using mojang mappings, remapped to spigot mappings when built, however because each flavor (bukkit/spigot/paper/purpur/<insert meme flavor>) can't agree on a standard for some names, dynamic reflection is used in these cases. If you are having issues with certain features of Iris, please reach out to us on iris-support in discord with details about your flavor so we can fix it.
• Overhauled the overworld to take advantage of the new height limits, bigger hills, more dramatic terrain & overall more beauty.
• Added a new ore system for more uniform ores, we still use the deposit system because its incredibly fast, however if you need more control, use the new ore system (uses 3D noise instead of precached objects)

There were a lot of changes going from 1.17 to 1.18, this is the first update for 1.18, there may be bugs, please let us know on discord if you find any!