Blizzard
The Blizzard is an event that happens when it rains in a snowy biome. If your not taking cover And Not Wearing Leather, Polar, Or Cyro Armor. You Get slowness weakness and blindness.
Mobs
There are Two Categories of Mobs
Dungeon Mobs that spawn In Ice Dungeons
And Frost Raid Mobs that spawn In the Frost Raid
Bosses
Palette Lib Is only needed for 1.20.1