<s>[INST] I want to create a mod for Minecraft that adds a few new biomes to the game, including a "Frostbite biome" that has ice blocks as the primary terrain, snow-covered trees, and snow-covered grass. I also want to add a custom ice block that has unique properties compared to the regular ice block.

To implement this, I will need to use the Minecraft Forge modding API. Which classes will I need to use to create the custom ice block and the Frostbite biome?[/INST]