Hooray,pass today's nightmare DD at 3rd try.
Team lineup
1) A.Sieg (46,full equip), A.Li (42,full equip but no jewels), A.Chancellor (46,full equip) ,Yeon Hee (36,full equip) ,Diao-chan (30,half equip).
2) Defensive mastery (except speed and counter,make the enemies do speed atk/counter less)
3) Formation 4-1 (No Nezha or other formation changing shenanigans

so formation is important) with A.Sieg in front,followed by A.Li, A.Chancellor,Diao-chan then Yeon Hee (Ryan seems better so use him if you got him

).
The idea is to let A.Sieg tank most of the dmg and to proc his passive frequently.
Wave 1 and 2,start with Diao-chan VS skill as always followed by Li's 1 hp skill.Alternate between Chancellor (Sword of Brilliance) and Yeon Hee (Gesture of Destruction) buff reducer skill to shred off all enemies shield (and buffs) and kill off the the 1 Hp enemy b4 reusing Li's 1 hp skill on another target.Don't forget to spam Diao-chan's VS skill when available for extra safety net.Rinse and repeat.
Tips: After Chancellor and Yeon Hee buff reducer skill is used,if enemies still have VS,continue with Chancellor and Yeon Hee's other multi hit skill to shred off remaining VS.Also highly recommended to refresh team VS with Diao-chan b4 going into next wave OR refresh VS at start of the new wave.
Wave 3,same tactic as above but Yeon Hee probably will get koed this round but no fear,use Li's Kage Bushin No Jutsu to summon clone and abuse the 1 hp skill in dps rotation.
Hope this help those without A.Feng Yan and A.Ruri yet.
PS:Inspired by a Indonesian player (for using A.Sieg),video link below.
» Click to show Spoiler - click again to hide... «
This post has been edited by Obiwanoobie: Aug 18 2017, 09:26 PM