On the vast square, Lu Chenzhou walked around with his spear.
Before long, he arrived at the edge of a circular pool with a diameter of ten zhang and a depth of about three zhang.
The pool had no water, only strands of electricity flowing through it.
Around it, chains gathered at the bottom of the pool, imprisoning a purple skeleton with a human head and dragon body.
This skeleton had been dead for countless years, yet the remnant aura it emitted made Lu Chenzhou's face serious.
"This thing looks like the ancient well I saw in the Void Realm of Changbai Mountain."
[You don't know, huh? This is a Dragon-locking Well, the most common array in the Great Wilderness, usually used to imprison fierce beasts. But the one here seems to be a mutated thunder attribute monster. When it was alive, it might have had the power of a Demon Emperor. This Five Thunders teacher used it as the formation core to create a Thunder Pool, borrowing the Demon Emperor's thunder to refine the body.]
