FrostRealm

FrostRealm adds a dimension of eternal cold, where land that was once barren has been frozen and then purified by the traveler. The dimension is filled with aurora crystals and mysterious flora, and it is described by its author as a fascinating world. Entry requires a portal built from snow blocks, in the same way a Nether portal is lit, and a route through the overworld to a cold biome where a stray warrior can be found.

Progress in the mod starts with the stray warrior in the overworld's cold biome, who must be fought to obtain a necklace part. Once the necklace is held, a second part is needed before the portal can be built. Monsters with special mutations appear in the dimension, and sometimes abnormal weather brings them out. Some of the monsters spawn because of these weather abnormalities, and the plants and creatures are strange and interesting. A unique weapon type is also added.

FrostRealm requires Bagus Lib. It is published for NeoForge only, for 1.21.3 – 1.21.10, and its latest file targets 1.21.10. Both client and server need the mod. The code is open source under the GNU Lesser General Public License v3.0 only, and the source is public.