One way could be to introduce a unique magic or weapon that specifically targets the Schnee's defenses. Another option is to build up a series of events that lead to their downfall, like a betrayal by someone close to them.
Well, it depends on the specific plot and setting you've established. Maybe you could have a powerful enemy or a tricky trap do the job.
To kill a Schnee in such fanfiction, you might consider giving them a fatal weakness that gets exploited. Or have them face overwhelming odds in a battle they can't win.
Chapter 136, "He Yuanhun, Yuwen Hu, Yuwen Dao (Three in One)", is the clearest early answer because it turns Demon Sheep's situation into a concrete plot event. The setup is From the beginning, He Meng and his group's arrogant demeanor; Until..., but the pressure keeps building through Despite the hunting of the Demon Sheep just now, this group showed a....
Chapter 137, "Attempt to Breakthrough, Dispute [Trinity]", is the clearest early answer because Great Xia Camp finally turns buildup into a real advancement. The chapter turns that into something concrete by moving from The Bamboo Tower is about ten meters wide, divided into three levels,... to Afterwards, I offered half of the Cold Beast Blood, which he....
Chapter 80, "Outsmarting the Frost Wolf Pack", is the clearest early answer because it turns Frost Wolves's situation into a concrete plot event. A useful checkpoint is the way the scene starts with How did we end up encountering a pack of Bone Spur Frost Wolves? and follows through with Xia Hong and Luo Ming turned their heads, their faces instantly....
Chapter 115, "New Earth-digging Realm, Enhance Mining Efficiency [Three-in-One]", is the clearest early answer because Enhance Mining Efficiency finally turns buildup into a real advancement. It opens with Since contributions vary, the emergence of hierarchy and comparison... and closes on When he looked up, his flushed face was full of astonishment..
Chapter 127, "Breakthrough Ideas for Cold Resistance Level", is the clearest early answer because Yi Blade finally turns buildup into a real advancement. The chapter turns that into something concrete by moving from Tong Xinglong's explanation was rather redundant. to Underneath the sunlight, Xia Hong's finger wound slowly healed.. What makes it stick is that it turns Yi Blade's growth into a concrete upgrade step and sets up the next payoff in the power growth storyline linked to Tong Xinglong.
Chapter 118, "Poison Sac, Bow Making [2 in 1]", is the clearest early answer because it turns Xia Hong's situation into a concrete plot event. It opens with This number, although large, is actually not unattainable. and closes on There should still be a bit more at the mine; I'll first mass-produce....
Chapter 168, "Snow Bamboo, Longyou, Sudden Wealth - Part 3", is the clearest early answer because it turns Hive Camp's situation into a concrete plot event. The chapter turns that into something concrete by moving from Xia Hong encompassed the entire Arrow Bamboo Forest on the scroll,... to So far, Great Xia has ventured only about three to four kilometers.... What makes it stick is that the chapter closes with Xia Hong paid it no mind at all;
Chapter 170, "Camp Integration, Territory Rapid Expansion (Part 1)", is the clearest early answer because it turns Luo Yuan's situation into a concrete plot event. The chapter gives readers a real answer by opening on The wooden hut structure has completely collapsed, and many iron... and ending on With the population suddenly skyrocketing this much, the urgent need....
Chapter 143, "Getting a Bargain and Being Malicious [Triple-Length Chapter]", is the clearest early answer because it turns Cheng Feng's situation into a concrete plot event. The chapter gives readers a real answer by opening on First Year of the Great Xia, February 22nd Second floor of the wooden... and ending on In the last half-month, the Hunting Team has brought back three....
Chapter 204, "Homecoming, Unease, and Birds", is the clearest early answer because it turns Lin Kai's situation into a concrete plot event. The chapter turns that into something concrete by moving from The first year of Great Xia, December 30th, just after nightfall. to Once we reach Great Xia, I will plead with the Minister; if that....