Insights

Michael's attention was pulled to the remaining traces of Extraction. They were still inside the Horned Werewolves, slowly draining the remnants of origin energy inside the corpses. 

The extracted origin energy immediately entered Michael's body, replenishing his used-up energy.

'I can even extract their origin energy? That's pretty useful,' Michael mused, a vivid smile blossoming on his face.

If he could replenish his used-up energy by using Extraction on the corpses of the battlefield, he wouldn't have to worry about his high energy consumption.