It was a very useful ability to trap the enemy inside the area of effect of this structure. It also meant this layer should be activated after activating either one from the first two layers.
The first layer swept the entire area with the energy flood from the structure, and the second one changed the shape this energy came out with.
So the one controlling this structure had to take note of that.
The second thing I thought about was the amount of energy expenditure. Activating the third layer jumped the energy expenditure up to five percent.
That meant if the dark gold bones gave me over two months time after using the first layer, then by using the third one, it'd only last for around twelve days.
That was a big decrease in the time provided by my bones. And I knew such time would greatly be lowered when using the silver grade bones.
"Tsk! And that's just by activating the third layer. What will happen when I activate the fifth layer then?"