Arknights Barren Plaza : Estelle Showcase!
It's a footage of Estelle duo'ing the map in the third daily of CC#0, at risk 8.
Estelle is a self-sustain AOE guard who is very powerful against enemies weaker than herself.
This map is the perfect case that meets her criteria, and the video shows how she is able to single-handedly mow down all the enemies~