{Void Ruler}
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Oberon was tremendously powerful, the Unique Skill he was using, without a doubt, was actually a Fusion.
He fused several Unique Skills, not dozens, not hundreds, this might be the result of thousands of fused Unique Skills.
Harvested over hundreds of thousands of years from many people that had been reincarnated, kidnaped, and tortured by him.
This power, the ability to manipulate the Element of the Void.
I call it [Void Ruler].
It is most likely at the same level as Pandemonium's Unique Skill.
Something that can defy the world, the laws, and everything.
There was a mental list in my mind of everything it could do, which I gathered as I fought with him.
He can gather an infinite amount of energy from the void.
He can summon the void into a near indestructible domain devoid of oxygen or any other energy than void.
He can manipulate the void, obviously, and create life from it, Voidlings.