An optional side mission called "The Two Walls Stand Tall" within Wo Long: Fallen Dynasty sees players try to beat two former allies named Xiahou Dun and Xiahou Yuan right before the game's final story chapter. Two humanoid enemies that use their expertise in combat in cohesion with each other, these two warriors provide a substantial challenge as players have to juggle two bosses at once. However, unlike the fight against the monstrous Xiahou Dun in the "War's Flames Burn Fiercely" mission, this boss battle sees both characters wielding a variety of magics alongside physical attacks designed to exploit the player's bad habits.

https://screenrant.com/how-to-beat-xiahou-dun-xiahou-yuan-wo-long-fallen-dynasty/