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Resource Pack adds fog to the Pale Garden biome exactly as it appears in both vanilla and backporting mods.
This is a resource‑pack–based evolution of the Foggy Pale Garden mod, built on top of the capabilities provided by the Polytone and Respackopts mods.

🧠 Smart Fog in the Pale Garden Biome
🕳️ Fog dissipates when you descend into caves beneath the biome
⏮️ Backport Support for "The Garden Awakens"
🔧 Visual Settings & Localization
🎨 Fog Density Presets
`I Am Not Afraid, But...` – introduces a slightly denser fog
`Stephen King` – a very thick fog that makes encountering a Creaking truly unexpected (just like in the novella *The Mist*)
Supported on all Minecraft versions and mod loaders that include Polytone v3 or higher.
resourcepacks folder
Enable Foggy Pale Garden in the in‑game resource pack menu
Currently, presets are indeed not applied if the resource pack is loaded as a zip archive. However, they are successfully applied if it is loaded as a folder.
It appears to be an issue with Respackopts. I have opened an issue in their tracker https://youtrack.frohnmeyer-wds.de/issue/RPO-40 (fixed in 4.13.6)
You’re free to include this resource pack in modpacks without requesting permission.