Bzzt. Swoosh. Kick.
Eren was busy fighting it out with city residents.
***
The city residents were nothing but human dolls made from the shadow element. And since they were made from such an element, they could mimic the properties of other elements depending upon the participants they were fighting.
It was clear to Eren that the Sansara Sage was a shadow-element user. He had created various shadow-element arrays and subarrays that supported the functions of these shadow-element human dolls inside the testing ground.
The human dolls had human-like bodies and features. But they were genderless, clothless, and faceless entities. It looked like a shadow had turned solid after looking at these human dolls.
At its foundation, the shadow element mimics other elements. The Sansara Sage used that property of the element as a foundation to create these human dolls. And the results he obtained from doing something like this were outstanding.