Test on others first.

Ozul unconsciously opened his eyes and stared at Raven's stomach which caused her to feel even more embarrassed.

He just noticed how that minuscule part of the black smoke in the potion immediately scattered inside her body before it somehow helped in regenerating the lost cells of the injured part of the body.

That process was complicated and he didn't know how it could help in creating cells of another body, but what he found next was the main cause of his surprise.

After the potion did its work, it should have disappeared or something. However, he felt the small traces of his essence still lingering inside Raven's body!

He hurriedly closed his eyes again and focused on that small trace of the essence and noticed how it slowly moved towards Raven's heart.

He was in for another shock because when he deeply felt the area around her heart, there was even more of his essence surrounding it!