Based on the essence fluctuations, they were probably an Aetherial Realm martial artist. The fact that they could kill a C-tier Malevolent Phantom shows they'd made real progress with soul techniques.

"What a waste of talent, throwing themselves away like this," Felix muttered.

Felix had a bad feeling. Was this a test run, or did they actually think this creature could take down a Grandmaster like him?

He pulled out his phone and called Xena. "Did Elliott's experimental data get leaked?"

Xe