E6 S1 Jing Yuan + 4pc Pioneer, with E1S1 Sunday, E1S2 Ruan Mei, E0S0 Dan Heng. MoC v.3.7

Honkai: Star Rail (3.7)

2 cycels

Jing Yuan's E6:
"Sweep, Souls Slain"
Each hit performed by the Lightning-Lord when it takes action will make the target enemy Vulnerable.
While Vulnerable, enemies receive 12% more DMG until the end of the Lightning-Lord's current turn, stacking up to 3 time(s).

After further investigation, this "debuff" from E6 doesn't show up on boss's HP bar, and doesn't trigger 4 pc "Pioneer Diver of Dead Waters" relic set. In the video it is triggered with Jing Yuan's break ._.
(I really hoped his "Vulnerable" counts as debuff, but it isn't...)

"Pioneer Diver of Dead Waters" relic set:
2-Piece Bonus
Increases DMG dealt to enemies with debuffs by 12%.
4-Piece Bonus
Increases CRIT Rate by 4%. The wearer deals 8%/12% increased CRIT DMG to enemies with at least 2/3 debuffs. After the wearer inflicts a debuff on enemy targets, the aforementioned effects increase by 100%, lasting for 1 turn(s).

Other debuffs I got from:
1) Ruan Mei's ultimate:
"Petals to Stream, Repose in Dream"
Support | Energy Cost 130 / Gen 5
Ruan Mei deploys a Zone that lasts for 2 turns. The Zone's duration decreases by 1 at the start of her turn.
While inside the Zone, all allies' All-Type RES PEN increases by 25% and their attacks apply Thanatoplum Rebloom to the enemies hit.
When these enemies attempt to recover from Weakness Break, Thanatoplum Rebloom is triggered, extending the duration of their Weakness Break, delaying their action by an amount equal to 20% of Ruan Mei's Break Effect plus 10%, and dealing Break DMG equal to 50% of Ruan Mei's Ice Break DMG.
Enemy targets cannot have Thanatoplum Rebloom re-applied to them until they recover from Weakness Break.
(yes, Thanatoplum Rebloom counts as debuff)

2) And Preservation Light Cone "Trend of the Universal Market":
S5: A New Round of Shuffling
Increases the wearer's DEF by 32%. When the wearer is attacked, there is a 120% base chance to Burn the enemy. For each turn, the wearer deals DoT that is equal to 80% of the wearer's DEF for 2 turn(s).

I hope you liked this funny build!

00:00 The run
04:17 - E6S1 Jing Yuan
04:21 - E1S2 Ruan Mei
04:25 - E0S0 Dan Heng • Permansor Terrae
04:29 - E1S1 Sunday