Clues

Fritz, the leader of the Warlords Clan, had decided to attack the Stone Mountain Clan after he heard that they had just fought against three Tyrant Zombies. He believed that they weren't in a good state to fight them and this would be an easy win with their trump card ready.

Indeed, his Clan was only Ranked 37, but he had the courage to fight them and take their territory because of an item that he had recently obtained after saving up their Reputation Points.

They were able to purchase two Attack Drones that were now being controlled by other members of his Clan outside.

As soon as they reported that there weren't any signs of survivors, they slowly entered the castle gates and confirmed that the place indeed looked abandoned.

Of course, it could still be a trap, but after several scouts tried to assess the situation, they confirmed that there weren't any signs of life inside.