Ever since his awakening, Nightwing knew summoning golems instilled in his brain.
The Hydra with numerous Elemental Cores allowed him to also borrow from his knowledge to summon these golems. Back when he had 'awoken' in Luigi's mansion, he had already slain numerous tribes in the underground world and sacrificed them to create the powerful golems of numerous elements.
But Nightwing's summoning and method of creating these golems greatly differed from the ways that humans did.
Humans would harness the power of 'life' and instill it in the golem. This allowed the golems to move. But Nightwing's method harnessed death.
Death energy was used to create life. And this was very difficult that only a few necromancers could pull this off. If a necromancer could raise Golems, they would be considered geniuses.
