The Ice Spirit Tribe side story is taken from The Great Ruler (TGR).
Novel
Side Story
1. Ice Spirit Tribe Chapter 1
2. Ice Spirit Tribe Chapter 2
3. Ice Spirit Tribe Chapter 3
4. Ice Spirit Tribe Chapter 4
5. Ice Spirit Tribe Chapter 5
Complete Stories for 1-6: https://www.wuxiaworld.com/novel/wu-dong-qian-kun/wdqk-sidestory-1