Batwoman's Tower of Babel Protocol for dealing with the Justice League? To Luthor, it was merely a reference. In truth, he had far better methods than Batwoman.
For instance, in the Tower of Babel Protocol, Batwoman had intended to use Green Kryptonite against Superman, bringing it into close contact with him or making him inhale Kryptonite dust, thereby completely stripping a Kryptonian of his combat ability.
But the Tower of Babel Protocol was a plan to defeat the Justice League, not eliminate them. Luthor was merely looking at the answer for reference; he still had to solve the problem himself.
He had invented Artificial Kryptonite, the Red Sun Generator, the Anti-Superman Armor, and Artificial Superman. Who would still think much of Batwoman's crude little plan?
Never mind anyone else—for the members of the House of El, Luthor had a hundred ways to make their lives worse than death.
The principle behind the Red Sun Generator was simple enough. It mainly used technology to imitate Krypton's original sunlight frequency, completely reducing Kryptonians to ordinary mortals.
Superman's "hometown," Krypton, lay 27.1 light-years from Earth, in the southern constellation Corvus. The planet orbited the star LHS2520, a red dwarf smaller and cooler than the Sun.
When Kryptonians had originally lived on their home planet, they possessed no superpowers at all. They were just like ordinary humans, except their technology was more advanced.
Later, however, Krypton exploded. Superman arrived on Earth as everyone knew, and discovered that the Solar System's Yellow Sunlight could be stored within his body, transforming him into an extraordinarily powerful being.
He chose to use those powers to help others and became a hero.
There was no need to mention Clark and Luthor's various grudges. In short, once the two had become enemies, Luthor had naturally investigated the origins of