The Rides to Lake Silberneherze level RS-EX-7, Junction, Challenge Mode, cleared using only Welfare operators.
This level took a lot to clear! And then I did not record it, so I had to try and replicate it. That was not easy, because my original clear was somewhat chaotic. This clear is also somewhat chaotic. Still, it works.
I basically used Gladiia, with rotating healers to keep her alive, blocking the top most row and using her third skill to deal with large groups of enemies before they overrun her. I added vanguards to generate DP and stall the enemies for a while. Then I built a massive kill zone in front of the bottom right gate with serious block, arts, and even physical damage. As you can see, it almost falls apart at the end and my ranged operators keep dying, but I manage somehow to pull it through.
Welfare operators are as defined at:
arknights.wiki.gg/
wiki/Operator/Welfare.
Comments and advice are always appreciated.