Five guards were murdered in the night at the quarry outside Meridian. Who, or what, could have killed them?
Talking to the Quarry Foreman, Aloy learns one of the guards was a friend of the Foreman from their days as slave miners during the Liberation. Suggesting that it may have been machines, the Foreman explains that while the quarry is fenced and gated, he's never heard of Glinthawks doing such a thing.
When asked if he had noticed anything strange in previous days, the Foreman says they were using explosives to clear away some of the bedrock. Afterwards, Saravad had mentioned that he didn't remember a certain pile of rocks that had appeared out on the quarry however the Foreman had waved It off, stating that it is nothing unusual in a quarry.
Investigating the quarry herself, Aloy approaches the mysteriously emerged mound. Shortly afterwards, a new machine, a Rockbreaker, emerges from the ground.
After defeating the Rockbreaker, Aloy returns to the Quarry Foreman who praises her bravery.