LAir's Dimension

Access to the dimension requires building a portal and lighting it with flint, after which the player can travel into a world with three biomes that are exclusive to it. The fiery biome contains a special structure housing a boss, and the frozen biome has a yeti living in an icy castle that players must prepare for before a challenging battle. Along with the biomes come unique structures, mobs and blocks.

The Ash Desert is a stark expanse with few ash trees and husk-like mobs, where scattered ash blocks inflict slowness on anyone who steps on them. The Ash Husks in that biome are immune to the effect, so they keep chasing without slowing down. Defeating the boss rewards the player with the Lava Stick, a weapon that shoots magical fireballs, and defeating the yeti grants Icy Boots that boost speed when walking across snow.

The mod runs on Forge for 1.18.2 only, and it is released under the MIT License without being open source. Client and server both need it, so the server and every player must install the mod to enter the dimension together.