Although I prefer to leave Dzu to their own devices, I could not help but send one of my students to analyze their sword. 

It is a remarkable device. I do belive it is directly connected to a sub realm. The energy it emits comes from that realm. 

How they managed to collect and fill that realm with such energy I do not know.

I do believe I know the source, as the potency of it is only matched by one other.

I do not fear Dzu, but I am wary of that weapon.

Still, they are very useful and make my own tasks easier with their presence.

-Notes by the Demon Master, The Head Master, collected by the Demon Master Bael