Rex Somniorum Eye

"Eros Eye: Sacred King Battleform." 

Zatiel's third eye glowed with a majestic sky-blue golden light. An endless vitality filled his bloodstream as bone spikes emerged from his elbows and knees along with red yang runes that enhanced the hardness and durability of every single organ. 

The Neo-Demon's body became as resilient as a High Rank 7 Artifact, and as long the enemy did not destroy his brain and hearts, every wound and missing limb would instantly regenerate. 

Next, the Yin-Yang Laws and the Origin Essence Wheel's force gathered in his arms, generating a red and blue lightsaber. They were better than any external weapon for the Neo-Demon, as they were perfect conduits for his powers.

Finally, the Law of Void and Space-Time Laws gathered around his arms and legs, forming plasma gauntlets and boots that pushed Zatiel's speed and dexterity to a whole new level, one so high that it would leave even the Shooting Star Bloodline eating dust.