A wave-like surging tremor. A sensation of pressure against one's body, mind, and spirit. That feeling of being surrounded, engulfed, and then tightly strangled.
The hearts of cultivators across the entire Grand Cyclic Stellar Region felt this singular sensation at the exact same moment for nothing more than the briefest time imaginable. Like a low whisper in the wind, tickling the ear, or the shadow at the edge of one's eyes. It attracted one's attention, but whether it was one's imagination or the truth of reality, it was very difficult to tell.
Wu Yu no longer sat in a meditative pose, rising to stand as he stared at the surroundings, his eyes glinting with a ferociously penetrative spiritual light. That sensation of spiritual pressure had vanished, but not before it burst with unfathomable force. It was for just a brief moment, but he had felt it as clearly as his own hand.