C6 Yun Jin + C0 Yoimiya | Spiral Abyss 2.4 | F12-9★

Full build at the end of video!
Blessing of the Abyssal Moon :
When the active character's Normal, Charged, or Plunging Attacks hit opponents multiple times within 2s, that character's Normal, Charged, and Plunging Attack DMG is increased by 5% for 8s. Max 15 stacks. This effect can be triggered once every 0.1s and will be cleared if the character goes down or leaves the field.
Floor 12 Ley Line disorder :
Certain opponents in this challenge possess the Honed Spirit effect, which grants them 10% Physical and All Elemental RES. When opponents with Honed Spirit take hits from attacks that are considered Normal Attack DMG, they will lose 3% Physical and All Elemental RES. A maximum of 30% of each may be lost this way. The RES lost this way will reset every 20s.