Neltharion did not enter the camp of the captives recklessly. Instead, it took a circle around the north of the lone island. The perimeter of the northern half of the island spanned approximately ten kilometers, and the camp of the captives on the ground already had a coverage of almost three square kilometers. It was quite huge.
Three layers of obstacles had been established out of the captive camp.
The first layer of obstacles was made of frost thorns that could resist extremely low temperature. They interweaved with each other like countless icy pitons and constituted a high wall more than twenty meters tall. Whenever a captive was close to the wall, the thorns would extend out and shake like vipers.
Behind the frost thorns was a high-voltage electric web with bluish electric arcs flowing through thick wires. Occasionally, two electric arcs would collide, resulting in brilliant sparks.
