A true Shadow Clan member

Ren who had suddenly disappeared shocked both Henry and Nila. Though Ren disappearing was not that surprising, the way he accomplished the feat that was surprising. It was a perfect disappearance, not a single mana fluctuation was made, his whole presence disappeared as if it became one with nature, not only that, but that move actually made them doubt that Ren was even standing there in the first place. This was either a technique that was better than [Shadow Treading] or this was the true form of that technique. 

While Henry and Nila were trying to find traces of Ren, they suddenly heard his voice echoing throughout the area. 

"Now, let's see how good your techniques are. Show me that you aren't disappointments!" 

Even though he was speaking they were still no signs of any mana fluctuation. They couldn't even trace where his voice was coming from, Ren truly was perfectly hidden.