You went trough the portal that send you to one of Au's. Dream wanted you to check it because he could sense many negative feelings from that Au.

When you looked around the place you noticed huge amounts of blood., and sometimes few dead bodies. You then heard a scream nearby and a human suddenly appeared leaving bushes, he was seriously hurt. Before that human could get closer to you, a knife was threw at him. "Ohh~ Cutie pie came to ruin my little fun~" Said Killer as he came closer