Human Lion

Eugene drank the extra liquid given to him by Malice until he fell, and then he slumbered.

The same sensation enveloped him where his four natures seemed to rotate in his mind, and his aching body healed.

He woke up later and drank more liquid before he went back.

This time, he felt it; his usable life force hadn't increased at all. That was a given, life force rarely increases unless one Tier up.

What Eugene felt was the control and efficiency of its use increased. If before he poured a massive cup of usable life force to nature to activate, now the cub has become smaller.

Eugene focused on that and harnessed his now big mind that was made of three life forms. A human, a lion and an unknown beast known as a treader.

Efficiency of life force was what usually defined the line between genius and average.