Bab 697: Ancient Ruin 

After Lina added her fourth pentagram to her magical powers, her strength increased significantly with her new ability.

Unlike her fellow hunters, who hadn't been able to fully develop their first essences through their new pentagrams, Lina's absorption caused her first pentagram to change color.

Besides the new ability of the fourth pentagram, she gained a variation of her first ability, as well as a strengthening of the old ability of the first pentagram.

Her mana became more powerful, more solid, to where even without leveling up, all of her abilities increased!

A Sovereign magician was someone with four pentagrams. A being at that stage who only had three magical essences would be weaker than if they had all four.

In fact, Sovereigns without their fourth essence were like Mages with mana equivalent to that of a Sovereign. They wouldn't really be Sovereigns until they added their fourth essence!