You can kill various animals found in the wild (rabbits, deers, etc) for loots. there are also several locations with legendary animals you have to kill, but these aren't mandatory
Some locations are called "cursed symbols" they're a white point/spider web on the map. a lot of them feature dismembered and/or burned bodies. you can recognize the cursed symbols thanks to the mist surrounding them
A man is horribly tortured to make a "blood eagle" (don't recommend looking it up, it's disturbing). While you don't see the torture itself, you are forced to listen to the sounds of the act and the screaming.
[spoiler]
in one of the main story arcs, one of the teenagers you're taking care of is killed by his mentor. you don't see the actual scene happen but you have to investigate where he was killed