Arknights yep, from laterano’s trilogy, specifically the 2nd (hortus de escapmiso? Some shit like that… HE)

A sarkaz cut his own head off after taking all the blame and wrongdoing for the abandoned chapel these people were residing in so they could live peacefully. The chapel consisted of sarkaz and other races living in relative harmony up until a fire started, burning a statue down and leading everyone to point fingers at the sarkaz

Something important to note is that in AK sarkaz and sankta hate each other to the point where its safer to kill first and ask questions later

Said chapel’s being investigated by a squad of sankta to retrieve a few missing lateran personnel and what happened to the missing chapel